![]() In each command, replace the name MyVolume with the name of your volume. These commands are dependent on the installer being in your Applications folder. At the Terminal prompt, type or copy and paste (easier and more accurate) one of the following commands.Find the Terminal app in the Utilities folder of your Applications folder.For this article, I used a 2TB USB hard disk drive erased and formatted as Mac OS Extended and given the name Installer. Plug in the USB flash drive or formatted volume you’re using for the bootable install disk.When the file is downloaded, double-click it to install an app named “Install OS X El Capitan” into your Applications folder. The installer has the name “Install macOS ”.įor Mac OS X El Capitan, the link downloads a disk image file named InstallMacOSX.dmg. For macOS Big Sur, macOS Catalina, macOS Mojave or macOS High Sierra, the links download an installer directly into your app folder. To ensure that you’re getting a valid, un-hacked, and legal version of macOS, you need to download it directly from Apple. These include HD Tune, ATTO Disk Benchmark, Disk Throughput Tester, AS SSD and etc.The macOS Big Sur download page in the Mac App Store Note: Although these tools are either designed specifically for testing USB flash drives, or good at at it, there are many other programs around to test the performance of hard disk drives and SSD drives that can also measure USB flash drive speeds. One issue is the program seems to cache the results so to run the exact same test again you have to eject and reinsert the drive or the read speed will show up as being astronomically high. Run the program (right click and select Open with > Java(TM) Platform Binary) and either select a drive or manually select a file on the drive. To get a consistent sequential read score, copy a large file of at least a few hundred Megabytes to an empty drive. File Read Test is a Java based tool which means it’s cross platform but you also need to have Java installed. It also needs data to be on the drive already because that’s what gets read back and where the result comes from. ![]() This last tool is a little different from the rest because it only tests read speeds. CSV file where you can keep a record of drives and scores. ![]() Because the test file is not that large it might give a slightly higher score than normal on faster USB drives. The included RMPartUSB.exe is called and runs the test by reading from and writing to a file of around 63MB in size. Run RMPrepUSB and select the USB drive from the top, then click the Test Speed button in the lower right. Make sure to download the portable version of RMPrepUSB from the long list of downloads. One of those functions is performing a read and write speed test. It’s like a Swiss army knife for USB drives because it can do so many different things. RMPrepUSB is a tool we have mentioned several times before. The result will show any recoverable or fatal read and write errors along with the final average speed. Therefore, we’d probably recommend stopping after five minutes or so to get a score. As Flash Drive/Card Tester is a testing tool it will keep going until the entire drive has been tested. The program is able to perform a read test, a destructive write test, or a combined read, write and compare test. It’s the only tool here that specifically needs installation. Check Flash is portable and also has some command line options in Switches.txt.įlash Drive/Card Tester is more of a tool to check your removable USB flash drives, Compact Flash cards or SD cards etc for read and write errors, but also shows the speed of the drive while it’s being tested. Because all the available space is utilized, this test could take a while on empty larger flash drives. The file will be limited to 4GB for FAT/FAT32. The “Use temporary file” method is non destructive and will fill all the remaining space on the drive with a temporary file and then perform an error check on it while recording the read and write speeds. In addition, using the more advanced logical or physical Access types allows flash drive erasing, backup and restore and also partition editing. The main function of Check Flash is to scan a USB flash drive for possible errors, but it also runs a read and write speed test while doing so.
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