3 stable releases

new 1.2.0 Nov 20, 2020
1.1.0 Nov 11, 2020
1.0.0 Nov 10, 2020

#91 in Filesystem



disktest - Hard Disk (HDD), Solid State Disk (SSD), USB Stick, Memory Card (e.g. SD-Card) tester


Disktest is a tool to check Hard Disks, Solid State Disks, USB sticks, SD cards or similar storage media for errors.

It does so by writing a pseudo random sequence to the device and then reading it back and verifying it to the expected pseudo random sequence.

This tool can be used to:

  • Check disks for hardware errors (e.g. platter errors, Flash errors, etc...).
  • Overwrite storage media with a cryptographically strong pseudo random stream. This can either be used to delete existing data on the disk, or to prepare the disk for encryption.
  • Test for tampered media that pretend to have more storage area than they physically actually have. Sometimes such media are sold by fraudulent sellers for cheap prices.
  • ... probably lots of other tasks.

The random number stream is generated by the following algorithm: :


If more than one thread is used, then each thread generates such a random number stream, which are then interleaved in a regular pattern.


Installing from crates.io

Download the latest version of disktest from crates.io and install it to `$HOME/.cargo/bin`:

cargo install disktest

Installing from source package

Build disktest and install it to `$HOME/.cargo/bin`:

cd path/to/source/package
cargo install --path .

Running from source package without installing

Build and run disktest in place without installing it:

cd path/to/source/package
cargo run --release --  DISKTEST_OPTIONS_HERE

See below for a description of the available [disktest]{.title-ref} options.

Disktest command line options

Please run either of the following commands to show more information about the available command line options.

cargo run --release -- --help
cargo run --release -- -h
disktest --help
disktest -h


The following table shows some example speed measurements of disktest in various operation mode on different hardware.

These speed tests don't write to an actual disk, but only to the [/dev/null]{.title-ref} device, which is a device that does nothing. So these speed test results do not include the speed limits of any actual disk hardware.

Command Algorithm Hardware Data rate written

disktest -j4 -ACHACHA20 -w /dev/null ChaCha20 Intel i5-3320M; 2+2 cores 2.6 GHz 2.0 GiB/s disktest -j4 -ACHACHA12 -w /dev/null ChaCha12 Intel i5-3320M; 2+2 cores 2.6 GHz 3.1 GiB/s disktest -j4 -ACHACHA8 -w /dev/null ChaCha8 Intel i5-3320M; 2+2 cores 2.6 GHz 4.2 GiB/s disktest -j6 -ACHACHA20 -w /dev/null ChaCha20 AMD Phenom II X6 1090T; 6 cores 3.2 GHz 3.0 GiB/s disktest -j6 -ACHACHA12 -w /dev/null ChaCha12 AMD Phenom II X6 1090T; 6 cores 3.2 GHz 3.9 GiB/s disktest -j6 -ACHACHA8 -w /dev/null ChaCha8 AMD Phenom II X6 1090T; 6 cores 3.2 GHz 4.5 GiB/s disktest -j4 -ACHACHA20 -w /dev/null ChaCha20 Raspberry Pi 4; 4 cores 1.5 GHz 300 MiB/s disktest -j4 -ACHACHA12 -w /dev/null ChaCha12 Raspberry Pi 4; 4 cores 1.5 GHz 400 MiB/s disktest -j4 -ACHACHA8 -w /dev/null ChaCha8 Raspberry Pi 4; 4 cores 1.5 GHz 500 MiB/s

The read data rates are similar, because the algorithm used is exactly the same.

Note: The default rust compiler shipped with Raspberry Pi OS is too old to compile Disktest. A newer Rust compiler must be used on Raspberry Pi.


Copyright (c) 2020 Michael Buesch <m@bues.ch>

Licensed under the terms of the GNU General Public License version 2, or (at your option) any later version.


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