Disk cache in RAM. Creating a RAM disk and transferring the contents of the system folders “Temp” to it

Hello GeekTimes! Absolutely incredible power and performance is hidden in the word RAMDisk - Once upon a time there were even special devices that simulated the operation of a ramdisk at the hardware level - Gigabyte i-RAM, for example. However, now with access to a huge amount of RAM, building virtual disks is becoming even easier. What does this give? The answer is under the cut.

First, the hardware configuration - to make a looooong RAMDisk you need a lot RAM. “I have them” - 128 selected gigabytes of DDR4 HyperX Savage - how much more? Strictly speaking, my motherboard does not support such a volume of RAM, but with the help of a tambourine and a few other shamanic accessories, I managed to start the stand, albeit with a reservation, at a frequency of 2133 MHz. Otherwise, everything is of the highest standard - eight memory sticks of 16 gigabytes each, proprietary beautiful HyperX Savage radiators, long-lasting warranty period, technical support(in case you can’t handle the setup and installation yourself). This kit requires an appropriate test stand, and I also have it at my disposal.

• CPU: Intel Core i7-5960X
• Motherboard: ASUS Rampage V Extreme, Intel Socket 2011-3
• RAM: HyperX Savage DDR4-2666 128 Gb (8*16 Gb)
• System SSD: HyperX Predator PCI-E SSD 480 Gb
• Video card: AMD Fury X
• Power supply: Corsair AX1200i, 1200W
• Operating system: Windows 10 Professional (64-bit)

In the vastness of this RAM you can deploy anything you want. Surely you can run all installed programs at the same time, and maybe even several instances Mozilla Firefox(sarcasm), but today I’m interested in virtual disks.

When your computer has an indecent amount of RAM, you want to use it as much as possible, and RAMDisk is the most successful use. At the moment, there is a fairly wide selection of software for working with RAMDisk, but I will build using software that has already proven itself on the positive side and has collected a number of reviews - DATARAM Ramdisk and ROG Ramdisk.
The first software is shareware; previously it was possible to purchase a high-quality license with a good discount when purchasing AMD products.
The second option comes free with ASUS Republic Of Gamers series boards. As soon as testing takes place on the basis of the mother ASUS boards Rampage V Extreme/USB3.1 - it would be a shame not to appreciate the capabilities of this software.

Of course, the temptation is great to create 64 gigabyte disks, but I have two programs, which means they will try to eat up all the available RAM. Therefore, I will limit myself to two disks of 32 gigabytes each.

Testing the RAMDisk turned out to be quite difficult, because many programs do not want to deal with it, such as the familiar and convenient PC Mark 8 - it completely refuses to pass the test on the specified partition, giving an error. IN in this case, is affected by the fact that the use of RAM Disk will lead to a significant increase in the result and the system of protection against “unfair play” is triggered, because PC Mark 8 ratings are used by many enthusiasts to compare the performance of their systems.

Crystal Disk Mark 5.1.2

Crystal Disk Mark demonstrates that not all yoghurts are equally useful, namely the ROG disk is faster than the DATARam and quite significantly.

Copying a file from a RAMDisk to another RAMDisk is a very fun procedure - everything happens almost instantly. A huge video file, the recording speed of which on a RAM Disk is limited only by the reading speed from a USB source, flies at supersonic speed inside the RAM.

Copying a disk from an SSD to a RAM Disk is also quite fast - the speed is limited by the read speed from solid state drive, similarly in reverse side- you won’t be able to work faster than the SSD writes.

As an application software, I offer a purely subjective assessment: working with photographs in the DxO OpticsPro 10 application. The task was to export 20 photographs from RAW format Canon (CR2) to full-size JPEG with PRIME quality noise reduction enabled. Much of this task depends on the processor, but still working with data storage is also important.
The result is a difference of about 20 percent compared to exporting to system PCI-E SSD HyperX Predator. Is this too much? Yes, quite a significant increase, because overclocking the processor by 10% (300 MHz) changed the packet processing time by only 1%.

It was not possible to take advantage of all the benefits for games, or rather, everything works correctly, without any questions, but the FPS in two very demanding games: Middle-Earth: Shadow of Mordor and Total War: Attila did not increase relative to the test results of games that were installed on PCI- E SSD.

So what is a RAMDisk for? What can you speed up with it? Archivers (who needs to compress/decompress data so quickly). Browsers ( quick access to all the cache you have). Saving the recording resource of SSD cells (a controversial point when taking into account the cost of a large amount of RAM). content creators, spinners large files in Adobe PS/AI and so on (the most realistic example).

The cost of RAMDisk does not apply to strengths"project". Converted to ruble per gigabyte SSD drive will be much more profitable than a colossal amount of RAM - SSD Kingston KC400 with a capacity of 128 Gb costs from 3,800 rubles, a 128 Gb memory kit will cost 83,000 rubles. But the read/write speed exceeds budget SSDs by more than 10 times, and besides, a large amount of RAM has never harmed anyone. Unless the wallet will be unhappy, but who cares =).

There are some nuances and disadvantages: Small volume for storing information, although if we are talking mainly about temporary storage of media files during processing, there is no point in complaining. Second nuance: if there is no ASUS ROG board, there is a need to purchase a high-quality software to create a RAMDisk, Third feature: volatility - let the RAMDisk image be saved every time you exit Windows, but in the event of a sudden power failure, data loss cannot be avoided.

Thanks for your attention and stay tuned Kingston on Giktimes!

Even from a depressing situation with hardware there is a way out - from “voting with your wallet” to technical progress, which slaps the well-fed faces of marketers and forces them to release what customers crave. Everything will be great, we promise!
We are also damn, incredibly happy to communicate with like-minded people on our blog and intend to give high-quality Kingston hardware to our subscribers. At the end of June we will give 11 subscribers of our blog 1 SSD drive

After articles about creating a RAM disk And moving the system folder “Temp” In it, readers had a lot of questions, and a terrible holivar began in the comments on this topic. I've also been bombarded with them via email.

Indeed, the topic is not unambiguous and there are many nuances with features. I decided to express my opinion on this matter in a separate article, based on personal experience and googled information - this is the answer to users’ questions about the benefits of using a virtual disk in the computer’s RAM.

Is there any benefit to using a RAM disk?

No matter how some smart guys bang their heads against the wall, there is! And that's a fact. The Internet is full of screenshots with measurements of the speed of reading/writing data on the ramdisk...

I, too, was not lazy and made the following measurements (screenshots in the first article on this topic). Besides, why would they even create special boards...

...and whole external blocks for this matter...

On at the moment RAM is still the fastest storage medium.

Who needs a RAM disk?

Another thing is that not in all cases of using such a disk, performance acceleration is visible. Positive changes are very noticeable when installing programs (which unpack installers into a temporary folder), working with large graphic images in editors, with video transcoding, with processing large amounts of information (databases), subject to the transfer of temporary system files. A profile with a cache of any browser in RAM will also impress you with the result.

I don’t work with video encoding, but in Photoshop I immediately noticed a reduction in the time it took to open and save large images. The built-in file manager (Explorer) has also improved. Should we talk about the speed of the portable browser in my virtual disk? It just “flies” like a bullet.

Owners of SSD drives can thus reduce the wear and tear of their drives - the number of read/write operations (cycles) will be significantly reduced.

Who doesn't need a disk in RAM?

It is absolutely not needed by players (gamers) - modern games just RAM eaters. Such virtual disk will only steal a piece of it and ruin the whole thrill (if you don’t have 32, 64 or 128 GB of this stuff).

This method of speeding up a computer is contraindicated for those who like to keep 2-3 browsers running at the same time. dozens of active tabs in each (I know several weirdos personally). With such a thoughtless manner of using machine resources, the more RAM, the better.

If you have less than 4 GB of RAM, it’s better to forget about this technology like a bad dream. Your system itself barely has enough of this volume, and also your appetites modern programs please note.

If there is no UPS (source uninterruptible power supply) or you are not the owner of a laptop, I recommend that you think 100 times - if there is a power outage, you will lose all the data on such a disk (they will not have time to be saved to the physical disk).

I categorically do not recommend using this method of speeding up the system for inexperienced, suspicious and cowardly users - with trembling hands and not fully understanding what you are doing and why, you will only ruin the operating system (hello blue screen) and then blow your minds out to people on forums and websites, while simultaneously cursing me or the one who advised you to “speed up” like that.

For those who haven’t realized yet, such a drive is not at all suitable for storing photos, movies and music.

How much memory to allocate for RAMDisk

“I have 2-4-8... GB of RAM - should I make this fast disk?”

This is the most frequently asked question from users... to which there is simply no answer. Everything is very individual and depends on many factors. What is important here is the way you use the computer (I wrote about this above), the total amount of memory, the performance of the processor (it may simply not have time to process quickly incoming data), type of memory, its manufacturability(modernity) and speed...

This whole thing is very intuitive, I would say. You need to connect logic, experience and the results of experiments (your own and others) to calculate the optimal and safe size such an “accelerator” just for yourself.

I already wrote - I have 8 GB of memory in my laptop. It’s unlikely that I would have noticed even half of it was missing. I don’t play, I don’t convert videos, I don’t create masterpieces in graphic monster programs, I automatically close extra tabs in browsers - this RAM disk “accessed” me. I am completely satisfied with its work (I allocated 3 GB).

Why clean out the Temp folder?

A slight digression from the topic of the article, but also an answer to numerous questions. If you have moved a system folder with temporary files, it needs to be periodically cleared of accumulated garbage.

The point is that this folder dynamic (its size constantly changes) and when closing programs, not all their temporary data is deleted from the “Temp” folder. Eventually they can accumulate to obscene sizes and significantly reduce the size of a limited virtual disk, leading to glitches and other problems. These are not tens of gigabytes for you. system partition on your hard drive.

In a previous article, a commentator under the nickname Shill kindly suggested this method of cleaning our transferred folder - create a separate RAM disk for it and in the settings disable saving to a physical disk upon completion of work, so that it is automatically cleared for us.

RAM drive, RAM disk (disk in memory), electronic disk - computer technology, allowing you to store data in high-speed RAM as on a block device (disk). Can be implemented both in software and in hardware.

The idea of ​​using semiconductor memory as the main storage medium in a PC did not arise today. Its implementation is possible in the form separate device, and in the form of a virtual disk in RAM.

The effectiveness of this approach can be debated; there are different opinions: some talk about an increase in productivity by orders of magnitude, while others deny the feasibility of RAM Disk in principle.

Having read some information on the Internet and tried using memory as a disk on my computer, conducting appropriate tests, my experiments and those of other users showed that with a sufficient amount of RAM, using a RAM Disk almost always has a positive effect.

The number of calls to hard drive(the HDD resource increases), the execution speed of some applications increases, although not hundreds of times, as some promise.

For example, we need to work with photographs or a video file, we write it (them) to a disk in memory and work with these files at the speed and speed of the memory we have. True, there is a nuance: the memory must be commensurate with the files and the cache for processing them. And if the power suddenly goes out, all your work can be lost. So we use UPS or a laptop :)

Many browsers store a lot of all sorts of junk in databases that hardly use the computer's memory, as a result, after a month of use, even typing an address becomes torture - the hard drive creaks, letters are typed in a second. All these problems are removed.

Main advantages:

# Extremely high speed access (up to several gigabytes per second);
# No delays during random access;
# Implementation without the use of additional hardware components;

Main disadvantages:

# Consumption of an extremely valuable resource (RAM);
# Small capacities (if there are 500-1000 GB hard drives on the market, RAM modules are calculated in units of gigabytes);
# Loss of content on shutdown (can be partially overcome by saving content to disk when shutting down, but the risk of losing information due to an unexpected power outage still exists);

Attention! I warn you - this article is for advanced users, there is a lot pitfalls! So everything you do, you do only at your own peril and risk.

So, the idea is simple. Make a RAMDisk (virtual “disk” in the computer’s memory) and force programs to store their work there.

1. Download one of the programs for creating a virtual disk in RAM - RAMDisk “\Enterprise\”. Among all similar products, RAMDisk “\Enterprise\” stands out, if only because the Russian version of RAMDisk “\Enterprise\” is distributed free of charge, and also has sufficient functionality and stability.

RAM Disk: http://ramdisk.nm.ru/ramdiskent -rus.htm

The software consists of a RAMDisk driver (RAMDriv.sys), an installer support library and property page (RAMDriv.dll) and an installation file (RAMDriv.inf), which together, through the “Hardware Installation” wizard, allow you to install RAMDisk on Windows 2000, Windows XP, Server 2003 and Vista.

For Windows 7 - go to Toolbar, System and Security, Device Manager. In the Action menu, select install old device. And manually point to the driver file.

In other systems, I think you will figure out how to install it yourself.

The settings are set through the RAMDisk properties in “\Device Properties\” through “\Device Manager\” Windows. New values ​​can be activated without rebooting.

Click configure operations with image file and create an image file.

To ensure that our data is not lost, check the “Save image when unloading driver” checkbox. Booting and shutting down the system will take a little longer, but for us the main thing is fast work.

If you work with photo or video data and don’t want to accidentally lose it, you can periodically dump the disk image onto a hard drive by selecting the appropriate option “Save the contents of RAMDISK in an image... etc.”

In principle, that's all. Check the box “Restart RAMDISK after clicking OK”, click “OK” and enjoy.

A virtual disk can also be used for its intended purpose (like a regular storage device - HDD), placing on it not only temporary and swap files, but also programs, user profiles, etc. There are publications with recommendations for using RAMDisk for storing temporary 1C files , one of Photoshop's "scratch disks", etc. Moreover, it is argued that productivity actually increases, although not significantly.

An interesting solution may be to use RAMDisk to improve system security, since data in RAM is destroyed when turned off. Naturally, in this case, the function of saving/recovering virtual disk images should be disabled.

Now a little about setting up Windows

It should be mentioned that the use of RAMDisk, depending on the tasks, may differ significantly, i.e. at the discretion of the user.

For example:

To change system operating parameters using standard procedures:

Let's set the size and transfer the swap file to RAMDisk.

We will perform a similar procedure regarding the placement of “Temporary Internet files”

Speeding up Firefox.

Open the "Start" menu and click "Run...".

In the window that appears, type %appdata%\\Mozilla\\Firefox\\Profiles and press “Enter”. A window will open in which you will see a directory named “abracadabra.default”. This is your Firefox profile folder.

Open the "Start" menu and click "Run..."

In the window that appears, type %appdata%\\Mozilla\\Firefox\\profiles.ini and press “Enter”.

Notepad will open with the “profiles.ini” file loaded. Replace "Profiles/" in the "Path" variable with "Z:\\", where Z is the letter of your ramdisk.

Make sure the "IsRelative" value is zero.

StartWithLastProfile=1

Path=Z:\\ abracadabra.default

Launch firefox and address bar browser enter about:config. We agree that we will be careful and end up on the firefoxa configuration page.

Right-click anywhere, select New -> String and set browser.cache.disk.parent_directory as the parameter name, and the path to the folder where the cache will be stored as the value. Z:\\ abracadabra.default

A few more settings:

// Cache and memory
user_pref(\”browser.cache.memory.enable\”, false); // memory cache becomes meaningless
user_pref(\”browser.cache.offline.enable\”, false); // why is this needed at all?
user_pref(\”browser.turbo.enabled\”, false); // for those who have it enabled, disable it. parameter loads the Fox part into memory for quick launch. Now we have everything quickly and in memory
user_pref(\”config.trim_on_minimize\”, false); // also not necessary. The parameter resets Fox from memory to swap. It still doesn't work on Vista and 7

Close Firefox.

Copy the “abracadabra.default” folder to the ramdisk. If there are requests to replace files, answer in the affirmative.

Restart Firefox.

We also change the paths of the system variables %TMP% and %TEMP%

Control Panel (this is for Windows 7), System and Security, View the name of this computer, additional options systems, environmental variables.

Change the system variables %TMP% and %TEMP% to the letter of your RAMDISKa Z:\\Temp:

The problem is that many programs, for example, WinRAR or installers, will unpack temporary files in R:\\TMP and if this file is larger than free space then the unpacking will not complete, and the archive will not be unpacked.

Is it worth it?

For me - yes. The health of the hard drive and browsing speed are very important to me.

There are inconveniences, but they are minor (saving the state before rebooting, restoring it when you turn it on - of course - not for a novice user), and you have to periodically clear the cache (but this can be avoided by taking up more memory for the RAMDisk or by writing a script that will clear the cache itself).

That's all for now, if anyone has any additions, write, we will add them.

The article is taken from open sources. Original article: //whitebrotherhood.ru/whitebrotherhood/node/15

Optimizing Windows as a method of improving computer performance is usually inferior to hardware upgrades. A rare exception to this rule may be the use of a RAM disk - a virtual disk created by special software using RAM resources - and the transfer of certain system and program operations to this disk. Why are there rare exceptions? This method of improving computer performance has quite a lot of conventions and nuances. We'll talk about them in more detail below, but first a few words about the performance of the RAM disk.

1. RAM disk performance

One of the reasons slow work computer – limited speed of reading and writing data hard drives HDD. Even the most productive hard drive, which impressed with test results for sequential reading and writing data, is unlikely to surprise with serious numbers when working selectively with small files. Namely, small files for the most part make up system cache, browser cache and other programs. Solve the problem of low HDD performance drives of a new format – SSD – are called upon. But not every user can handle their cost yet. SSD is today the only possible compromise between low-performance HDDs and ultra-fast RAM, but unable to permanently store data. The RAM disk created using the RAM resource has a speed of 400-600 MB/s, which only SSDs from good producers in conditions of sequential reading and writing of data, it can provide for selective work with small files. And the speed of sequential data reading and writing of a RAM disk is determined by thousands of MB/s.

Let's compare these results with the HDD.

As you can see, the read and write speed of the HDD is many times slower. Sequential read and write speed HDD data V best case scenario will be 150-170 Mb/s. And based on the results of measuring the speed of selective reading and writing of small files, alas, we get a catastrophic figure - 0.5-1 MB/s.

2. Conventions and nuances of optimizing Windows using a RAM disk

The inability of RAM to store information is a nuance that limits the use of a RAM disk only for storing temporary data. Fortunately, this problem is solved due to the functionality individual programs for implementing RAM disks. Such programs provide periodic recording of RAM disk data to a file on the hard disk. But with other nuances it’s not so simple.

A RAM disk can only be created if there is excess RAM. If, when performing normal operations, the RAM load is 70-80%, there can be no talk of any extra space. The remaining 20-30% of RAM can be used for some one-time operations. You can work with a RAM disk with at least 40% of RAM free - a resource that is regularly idle and does not participate in the operation of the system. It is advisable to consider the possibility of working with a RAM disk provided that the system has at least 8 GB of RAM. If this volume is not designed to work special software– hypervisors, complex professional software for working with video or 3D graphics, resource-intensive games, etc., the system can be left with 6 GB of RAM for its tasks, and everything else can be used for a RAM disk. In any case, excess RAM will be determined by the specifics of the tasks performed on the computer.

If both the hard drive and the processor are the weak point in the system, optimization using the RAM disk will not be of much use. RAM does not solve the problem of a low-power processor.

RAM disk is virtual device, implemented by third-party software. Accordingly, so that there are no problems in Windows work, such software must be supported by developers and adapted to version updates operating system, for which support is declared. Before testing programs that implement RAM disks, create a rollback point or backup copy Windows, as well as preparing rescue media for system recovery - mandatory measures precautions.

Free programs for implementing a RAM disk usually do not support the function of saving data to the hard drive. If to implement a RAM disk it is necessary to both increase RAM and purchase licensed program, it is advisable to compare these expenses with cost of SSD with a capacity of 120 GB.

Another important nuance is the red tape associated with creating a RAM disk and transferring data to it. In this regard, of course, the SSD will win - I bought the drive, connected it and forgot about the problems. Modern versions Windows 7, 8.1 and 10 themselves know which operations they should disable when they come on board computer SSD. By the way, creating a RAM disk and transferring to it individual system and program folders in which data is being actively rewritten is considered by some not only as an optimizing operation, but also as a way to extend the life of SSD services. This method may be relevant in conditions of industrial scale data rewriting or as a result of unsatisfactory results of assessing the remaining SSD resource. At home use A computer's SSD resource can last for many years. So, before diving into the red tape of setting up processes for the sake of extending the life of the SSD, it wouldn’t hurt to know approximate time, remaining until the storage device is exhausted. Such an analysis can be carried out special programs for health testing hard drives, in particular, Hard Disk Sentinel and SSD Life.

3. What data can be transferred to a RAM disk?

The easiest way to benefit from a RAM disk is to work with files transferred to it. portable programs. But based on the performance of the system as a whole and when working with installed programs You'll have to tinker with the settings.

Typically, RAM disks created without using the function of saving information to a file on the hard drive are used to store temporary data. By editing variable values Windows environments The RAM disk can be specified as the new location system folders"Temp". A RAM disk can be a storage place for the cache of browsers and other programs that require its placement not only on system disk C, but also elsewhere on the computer. To a RAM disk, implemented using programs that support the function of saving data to a file on the hard drive, for better performance when surfing the web, you can transfer not only the browser cache, but also its entire profile. This is done using symbolic links. Using the same principle, working data of other programs is transferred to the RAM disk. And especially sophisticated gamers purchase an extra 8 GB of RAM specifically for the RAM disk to fully install the game.

It is not recommended to transfer user profile folders, databases, project files to a RAM disk, even if implemented through programs with the function of saving data to a file on the hard disk specialized programs and other important information.

4. Programs for implementing a RAM disk

A RAM disk can be created using programs such as: SoftPerfect RAM Disk, Radeon RAMDisk, Gilisoft RAMDisk, Primo Ramdisk, etc.

SoftPerfect RAM Disk is one of the most simple tools in installation, configuration and use.

After installing the application, you just need to select the “Add boot-mounted disk” option to specify the letter, size and format of the partition on the hard drive or SSD to which data from the RAM disk will be written.

Its size can vary depending on the amount of RAM available, as well as what percentage of it you are willing to allocate for use as an in-memory disk.

Most modern PCs have at least 4 GB of RAM, which makes them ideal for using SoftPerfect RAM Disk - in such a system you can safely allocate 20-25 percent of the available RAM.

SoftPerfect RAM Disk takes care of the rest, including the ability to create more than one virtual disk. After assigning a letter, the drive will appear in the menu Windows Explorer and you can use it like any other device in the system.

But how to benefit from such a disk? First of all, it can significantly speed up the loading of any program that uses temporary (cache) buffers - for example, Adobe Photoshop.

The same applies to any web browser - if you configure it so that it uses the RAM disk as a buffer cache, it will not only work faster, but will also not clog up your hard drive with unnecessary temporary files.

RAM disks are also useful if you want to extend the life of an SSD device. It is a known fact that after a certain number of rewrite cycles solid state drives“wear out” and stop working. So if you're dealing with applications that love to constantly access disk device, redirect them to the created RAM disk - this way you will extend the life of the system SSD.

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The performance of a computer can depend on many components, but the most important of them, of course, are the physical characteristics of the processor and the amount of RAM. Methods that allow you to increase the speed of a computer programmatically, as a rule, have significant limitations, but they should not be neglected. If the RAM is much faster than hard drives, why not try storing and processing temporary files directly in RAM?

This can be implemented using RAM programs Disk from the famous software company SoftPerfect. The program creates a virtual disk in the computer's RAM on which the user can store and process certain temporary files. In theory, accessing these files should be much faster. In addition, according to the developer, the use of RAM Disk will not only increase the performance of the computer, but also significantly reduce the load on the physical hard drive and reduce fragmentation file system.

Installing SoftPerfect is not particularly difficult. Along with the program, a special driver is installed into the system. RAM Disk has a very simple and convenient user interface with Russian language support. Work in the program begins with the creation of a virtual disk. If you click the "Plus" button, a window will open in which you will need to set the size of the virtual disk, assign a letter and select the file system type, for example NTFS. You can also create the necessary folders - directory names must be entered on a new line.

After clicking the “ok” button, the disk will be mounted.

Size of created virtual disks limited. In this case, the program itself determines the maximum volume that can be allocated for such a disk. You can work with virtual disks in the same way as with regular partitions; you can copy files to them, install programs, etc. True, when you unmount the disks or restart the computer, all data stored on them will be destroyed.

There are two options here - either copy the data to a physical disk before turning off the computer, or save it to a special SVI image, also located on physical disk. You can create an image in RAM Disk by selecting the “Image” option in the menu.

In this case, you will need to specify the location of the image file, the size the disk being created and the type of its file system. After the image is created, all that remains is to mount it, not forgetting to check the “Save contents” checkbox. So if you are going to install programs on a virtual disk, choose this method.

It's hard to say how useful RAM Disk really is. It’s no longer often necessary to perform one-time actions; on the other hand, does it even make sense to create a virtual disk for editing one or two files? However, it's up to you to decide. RAM Disk is distributed completely free of charge, so download, test and draw conclusions. The program is compatible with all popular Windows versions, ranging from XP to Windows 8 and 8.1.

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