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README.rst

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  1. disktest - Hard Disk (HDD), Solid State Disk (SSD), USB Stick, Memory Card (e.g. SD-Card) tester
    2. 

  2. ================================================================================================
    3. 

  3. 

  4. `https://bues.ch/h/disktest <https://bues.ch/h/disktest>`_
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  5. 

  6. Disktest is a tool to check Hard Disks, Solid State Disks, USB sticks, SD cards or similar storage media for errors.
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  7. 

  8. 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.
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  9. 

  10. This tool can be used to:
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  11. 

  12. * Check disks for hardware errors (e.g. platter errors, Flash errors, etc...).
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  13. * 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.
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  14. * 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.
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  15. * ... probably lots of other tasks.
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  16. 

  17. The random number stream is a concatenation of hashes generated by the following algorithm:
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  18. ::
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  19. 

  20. 	S = PBKDF2(SEED | THREAD_ID)
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  21. 	HASH_DATA = SHA512(S | PREVIOUS_HASH_DATA | MONOTONIC_INC_COUNTER)
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  22. 

  23. If more than one thread is used, then each thread generates such a hash stream, which are then interleaved in a regular
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  24. pattern.
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  25. 

  26. 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.
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  27. 

  28. 

  29. Dependencies
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  30. ============
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  31. 

  32. * `Rust (edition 2018) <https://www.rust-lang.org/>`_ or later.
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  33. * Crate dependencies will automatically be downloaded by cargo.
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  34. 

  35. 

  36. Running without installing
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  37. ==========================
    38. 

  38. 

  39. Build and run disktest in place without installing it:
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  40. 

  41. .. code:: sh
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  42. 

  43. 	cargo run --release --  DISKTEST_OPTIONS_HERE
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  44. 

  45. See below for a description of the available `disktest` options.
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  46. 

  47. 

  48. Installing
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  49. ==========
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  50. 

  51. Build disktest and install it to `$HOME/.cargo/bin`:
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  52. 

  53. .. code:: sh
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  54. 

  55. 	cargo install --path .
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  56. 

  57. 

  58. Disktest command line options
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  59. =============================
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  60. 

  61. Please run either of the following commands to show more information about the available command line options.
    62. 

  62. 

  63. .. code:: sh
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  64. 

  65. 	cargo run --release -- --help
    66. 

  66. 	cargo run --release -- -h
    67. 

  67. 	disktest --help
    68. 

  68. 	disktest -h
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  69. 

  70. Speed
    71. 

  71. =====
    72. 

  72. 

  73. The following table shows some example speed measurements of disktest in various operation mode on different hardware.
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  74. 

  75. 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.
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  76. 

  77. ===============================  =========  =======================================  =================
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  78. Command                          Algorithm  Hardware                                 Data rate written
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  79. ===============================  =========  =======================================  =================
    80. 

  80. disktest -j6 -w /dev/null        SHA512     AMD Phenom II X6 1090T; 6 cores 3.2 GHz  675 MiB/s
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  81. disktest -j6 -ACRC -w /dev/null  CRC        AMD Phenom II X6 1090T; 6 cores 3.2 GHz  4.6 GiB/s
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  82. disktest -j4 -w /dev/null        SHA512     Intel i5-3320M; 2+2 cores 2.6 GHz        250 MiB/s
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  83. disktest -j4 -ACRC -w /dev/null  CRC        Intel i5-3320M; 2+2 cores 2.6 GHz        3.4 GiB/s
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  84. disktest -j4 -w /dev/null        SHA512     Raspberry Pi 4; 4 cores 1.5 GHz          75 MiB/s
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  85. disktest -j4 -ACRC -w /dev/null  CRC        Raspberry Pi 4; 4 cores 1.5 GHz          605 MiB/s
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  86. ===============================  =========  =======================================  =================
    87. 

  87. 

  88. The read data rates are similar, because the algorithm used is exactly the same.
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  89. 

  90. 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.
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  91. 

  92. 

  93. License
    94. 

  94. =======
    95. 

  95. 

  96. Copyright (c) 2020 Michael Buesch <m@bues.ch>
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  97. 

  98. Licensed under the terms of the GNU General Public License version 2, or (at your option) any later version.
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  99.