Feb 10, 2010 LIMITED TIME!!! GET MY NEW BOOK FOR $1! This video will show you how to make an auto-hacking USB drive and how to.
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One of my friends came up to me a little while back and asked me if I was interested in buying some USB flash drives from him. He had about 200 pieces, they are all new and are about 60% below the current market price. Itâs a very good deal when you can buy a $20 new USB flash drive for only $8. He couldnât reveal how or where he got it from and that alone got me a little worried about the quality of the USB flash drives. He also told me that there wonât be any warranty if the USB flash drive fails. So I thought that the possibilities are they could be either stolen or are rejected stock from the factory.
The only thing I am afraid of is using a stick for a few times and it couldnât read the files or canât detect the drive anymore. I have also heard several stories of people buying USB flash drives from places like eBay and their true capacity being only a fraction of what was advertised. So, with all this in mind, I told him that Iâd like to test the USB flash drives first before buying and he agreed. Windows comes with scandisk or chkdsk which I can use to scan for bad sectors but it lacks any soft of burn-in test or a test to check the true capacity. So here are 3 tools you can use to test the current condition and performance of a USB flash drive.
1. Check Flash
Check Flash (ChkFlsh) is a very simple flash drive testing and maintaining tool. I have used this tool several times to run a burn in read and write test on USB drives. If the device is able to survive after a few cycles, the USB flash drive should be OK. There are 3 access types and 6 action types for you to select. To access the actions of âRead stability testâ, âSave imageâ, âLoad imageâ and âFull eraseâ you have to change the Access type from temporary file to a logical or physical drive.
Other than checking for drive errors, it can also determine the read and write speed. The test length can be set to scan the drive just once, several specified passes, or leave it running until an error is found, or you tell it to stop. Check Flash is a free and single portable executable file. It can only test USB flash drive and not external hard drives.
Download Check Flash
2. RMPrepUSB
RMPrepUSB is a tool which is actually a USB formatting, partitioning and bootloader creation utility as opposed to a USB testing tool. While itâs not meant to be useful for doing a complete read and write scan, it does have a little function that can test your drive to see if there are missing or bad parts and what the actual usable size is. This is ideal to check if the drive is the capacity you believe it to be and is infinitely quicker than scanning the whole drive if thatâs all you want to do.
Make sure the USB drive IS EMPTY because any contents will be deleted. Simply insert your drive and select the âQuick size testâ. Portable and installable versions are available. This is also quite a good tool to experiment with bootloaders on your flash drive as there are several different types that can be used.
Download RMPrepUSB
While the Quick Size Test will give you a general idea of whether the entire size of the drive is available and working, it wonât run a complete test. To do that, you can download FakeFlashTest which is by the same developer and includes the quick test and another more comprehensive test.
3. H2testw
H2testw is able to test USB flash drives, memory cards and also internal, external and even network hard drives for errors. It simply works by filling the device with 1GB chunks of test data and then verifies it by reading the data back again. Usage is very simple. Select the English language because it defaults to German, select the target device, and then choose whether you want to test all available space or a specified amount of Megabytes.
Although H2testw is non destructive in that it wonât overwrite anything present on the drive, for best results, itâs recommended to have an empty and newly formatted device. This program has been found to be very good at testing both for errors and to find USB sticks with a fake capacity. H2testw is also a completely portable standalone executable.
Download H2testw
4. Flash Drive/Card Tester
Flash Drive/Card Tester is a tool weâve mentioned before because itâs a simple tool but can be used in a few different scenarios. In addition to being handy useful for detecting fake capacity drives, it can also show you how fast the drive can read and write data. Another thing itâs good for is testing for bad or problematic sectors on a flash drive or memory card.
All you have to do is select the drive to test and choose a âWrite, read and compareâ test, then start the process. The device map at the bottom will show a graphic representation of passes, write fails or read fails. Choose the Write log file option to output a possible list of errors to a text file. The program actually comes as a setup installer but weâve zipped the two files to make Flash Drive/Card Tester Portable.
Flash Drive/Card Tester Portable
5. USB Memory Stick Tester
This tool is very old dating back to 2005 but it still works and is only 66KB in size. USB Memory Stick Tester is a pretty simple tool to operate and will write and then read data to test for errors on the drive. There are only really two options to speak of.
The first thing you can change is the number of passes slider. Although it doesnât say, we assume it can be one to four possible passes. The other option is the test size which will be a percentage of the total size of the flash drive. Obviously, the higher the proportion of the drive is tested, the more likely it is that any issues or errors will be identified.
Download USB Memory Stick Tester
You might also like:8 Free Tools to Test Read and Write Speed of USB Flash Drives5 Tools to Test and Detect Fake or Counterfeit USB Flash Drives![]()
Warning re RMPrepUSB: Iâve downloaded and am testing all 3 apps mentioned in this article. I ran the âQuick Size Testâ and found that as a result of that test the formatting of the flash drive was deleted. All I wanted to do was have it check for missing/bad portions but got âmoreâ than expected.
Itâs not a big deal and I might have done something wrong so my report is mentioned as a FWIW.
Because of this Iâve decided to uninstall RMPrepUSB from my computer.
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Speedy2 years ago
Thanks guysâ¦just found a fake driveâ¦(512gb memory showing and actualy he has only somewhere around 15gb) also usb 2.0 not 3.0 :D so that meansâ¦a 16gb memori flash.
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You want to be careful on how you test flash drives. Flash memory has a limited number of write/erase cycles (Google âflash enduranceâ for info). Too many writes to flash when testing could result in premature failure. And never defrag a flash drive since that creates excessive writing to the drive.
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Tracy2 years ago
While it is true that flash memory has a limited number of write cycles, your concern about longevity is not reasonable. All flash memory on the market has a limit of between 10,000 and 100,000 P/E cycles. (Program/Erase cycles. Each set of Program and Erase functions represent one cycle.) Letâs put this in context. If you have a cheap flash drive that experiences such extreme use that, every day the drive is completely erased and filled to capacity; that flash drive should last 27.39726 years before it reaches complete failure. The heaviest use a flash drive is likely to see is when it is used as a ReadyBoost drive. This is when Windows is allowed to use flash as a buffer for a hard drive. I have two 8 GB drives serving that function and they each see daily use of around 4 GB per day. The expected P/E life is about 13.69862 years. The reality is that any flash drive will fail for other reasons long before you use up your P/E cycles. You also need to consider that the flash drive you favor today, is going to look pretty shabby in 4 or 5 years. Tech standards and data requirements change constantly and your hardware needs to change to keep up with those changes. So while I still appreciate what my pair of 8 GB USB 2.0 flash drives gave me in their time, they still got replaced with my pretty new 64 GB USB 3.0 drive. (Itâs 4x the capacity and real world performance for the same price.) Needless to say, I know longer care about the 2.0 drives. And in a few years I wonât care about my 3.0 drive. As if all that were not enough to convince any rational person that P/E cycles are a non issue, the next big leap expected in the NAND architecture is the introduction of 1,000,000 P/E cycles to MLC NAND. (That is highly speculative, but it is the boon the SSD market is hoping for. Think SSDâs that can compete with hard drives in terms of price, capacity and endurance.)
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Note, the 10,000 P/E cycle is for 50 nm MLC NAND and 100,000 is for SLC. With smaller lithographies and cheaper NAND pricing, the amount of P/E cycles have actually gone down for NAND used in consumer applications (e.g. consumer SSDs, cheap flash drives). The move to ~30 nm dropped down P/E cycles to 5,000 and ~20 nm dropped it further to 3,000 (but yay for cheaper SSDs!). Planar TLC NAND actually varies from 500-1,500 P/E cycles, iirc. Granted, the move to 3D upped P/E cycles by ~3x. While you may have NAND capable of 1,000,000 P/E cycles right now, no oneâs using them for $10-20 USB flash drives. Enterprise-level SAN or industrial applications, sure.
Granted, even at 1,000 P/E cycles, this is a non-concern for average users. 32GB * 1000 P/E cycles = 32 TB worth of NAND writes (not factoring write amplification). One would be more likely to lose the flash drive or have bought a bigger one before writing that much data to the drive.
Mind, I actually have killed a few flash drives running PortableApps due to excessive wear on specific cells (non-recoverable read/write errors). Guess wear leveling wasnât particularly good on those drives.
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gil7 months ago
thanks, I was getting worried about the earlier comment
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One more utility for testing and debugging USB which wasnât mentioned â USB test software eltima.com/products/usb-test-software/
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Saulo4 years ago
I got writing errors using 2 programs. Are there any programs to fix my USB flash drive?
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Hey, thanks a lot. useful tools, iâve downloaded them all. Problem is, the drives Iâm testing is 1TB large. 90 hours with âCheck Flashâ⦠95 min with the RMPrepUPBâ good advice
Again, thanks
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webnut12 months ago
Are you saying that is took 90 hours or so to test a 1 TB drive? Should I assume around 60 hours for a 64GB drive?
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1TB is 1000 GB so 64 GB should take about 6 hrs
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Pepe5 years ago
I made like 3 cycles on ready only mode with check flash and it didnt find any error, but in write and read test if found 48 errors, is it fake?
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You can also try FakeFlashTest.exe as a very quick test for fake flash media.
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Ali6 years ago
Dear Raymod Reply
Well Done for your useful article.
h2testw is kinda slow especially takes long while if you have very large size drives. Personally I used HDDScan to test usb flash.
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Super Sam2 years ago
I used the h2testw on 128GB, 1TB, and a 2TB flash drive. USB 2.0 metal keys configurations from China.
Ran over 100 hours, day and night. It Loaded thousands of files onto the flash drive. Read them back presumably. Gave output drive size. Close to as advertised. I did a DEL *.h2t to get rid of all those files. ThAT HAPPENED IN A FLASH.
i need this tools Reply
thanks.
mehdi10 years ago
thank you very nice
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Thanks, it works.
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Kn1012 years ago
Thanks Raymond. You rock.
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Nice tool Raymond.
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Timo Beil12 years ago
Thereâs more easy way to do that using the same OS API calls that will be used by any file manager tool should you happen to be needing to copy/write something on your USB drive. To do that you have to the following.
1. Select Start+R type cmd to start command prompt
2. In the command prompt window type:
fsutil file createnew X:dummy.dmp Y
where X is the drive letter for your USB stick,
Y is the number of kilobytes you want to write to your dummy.dmp file. Like if you want the file to be of 1 megabyte size type 1048576 instead of Y here (1 Mbyte=1024*1024=1048576 bytes)
If utility will fail to write this file, it may indicate you have problems with addressing or microchip on your USB drive.
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thanks Ray. nice tool.
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