disktest 1.0.0

Hard Disk and Solid State Disk tester
disktest-1.0.0 is not a library.

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

https://bues.ch/h/disktest <https://bues.ch/h/disktest>_

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 a concatenation of hashes generated by the following algorithm: ::


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

The algorithm can also be switched to a CRC based algorithm, that is much faster, but not cryptographically secure. However CRC is sufficient to find physical disk errors. Disktest defaults to the secure SHA512 based algorithm.


  • Rust (edition 2018) <https://www.rust-lang.org/>_ or later.
  • Crate dependencies will automatically be downloaded by cargo.

Running without installing

Build and run disktest in place without installing it:

.. code:: sh

cargo run --release --  DISKTEST_OPTIONS_HERE

See below for a description of the available disktest options.


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

.. code:: sh

cargo install --path .

Disktest command line options

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

.. code:: sh

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 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 -j6 -w /dev/null SHA512 AMD Phenom II X6 1090T; 6 cores 3.2 GHz 675 MiB/s disktest -j6 -ACRC -w /dev/null CRC AMD Phenom II X6 1090T; 6 cores 3.2 GHz 4.6 GiB/s disktest -j4 -w /dev/null SHA512 Intel i5-3320M; 2+2 cores 2.6 GHz 250 MiB/s disktest -j4 -ACRC -w /dev/null CRC Intel i5-3320M; 2+2 cores 2.6 GHz 3.4 GiB/s disktest -j4 -w /dev/null SHA512 Raspberry Pi 4; 4 cores 1.5 GHz 75 MiB/s disktest -j4 -ACRC -w /dev/null CRC Raspberry Pi 4; 4 cores 1.5 GHz 605 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.