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Several of the HTTP links are now available over HTTPS, and the documentation should link directly to the secure version of the referenced page. Along the way, a couple of broken links were updated.
61 lines
2.8 KiB
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61 lines
2.8 KiB
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History
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=======
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I started this project when I bought a 32GB microSDHC card for my
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Android phone back in 2010, and found out that this card always fails
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when one fills it up. Googling about this issue, I arrived at the blogs
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`Fight Flash Fraud <https://fightflashfraud.wordpress.com/>`__ and
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`SOSFakeFlash <https://sosfakeflash.wordpress.com/>`__, which recommend
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the software H2testw (see
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`here <https://fightflashfraud.wordpress.com/2008/11/24/h2testw-gold-standard-in-detecting-fake-capacity-flash/>`__
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or
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`here <https://sosfakeflash.wordpress.com/2008/09/02/h2testw-14-gold-standard-in-detecting-usb-counterfeit-drives/comment-page-3/#comment-9861>`__)
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to test flash memories.
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I downloaded H2testw and found two issues with it: (1) it is for Windows
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only, and (2) it is not open source. However, its author, Harald
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Bögeholz, was kind enough to include a text file that explains what it
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does, and provided the pseudo random number generator used in H2testw.
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F3 is my GPLv3 implementation of the algorithm of H2testw,
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and other tools that I have been implementing to speed up the
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identification of fake drives as well as making them usable:
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``f3probe``, ``f3fix``, and ``f3brew``. My implementation of H2testw,
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which I've broken into two applications named ``f3write`` and
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``f3read``, runs on Linux, Macs, Windows/Cygwin, and FreeBSD.
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``f3probe`` is the fastest way to identify fake drives and their real
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sizes. ``f3fix`` enables users to use the real capacity of fake drives
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without losing data. ``f3brew`` helps developers to infer how fake
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drives work. ``f3probe``, ``f3fix``, and ``f3brew`` currently runs only
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on Linux.
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Change log
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----------
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Starting at version 2.0, F3 supports the platform Mac. Mac users may
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want to check out Thijs Kuipers'
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`page <https://www.broes.nl/2012/08/verify-the-integrity-of-a-flash-sd-card-on-a-mac/>`__
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for help.
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Starting at version 3.0, F3 supports the platform Windows/Cygwin, and
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adopts H2testw's file format. People interested in exchanging files
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between F3 and H2testw should read the `section <#comp_h2testw>`__ about
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it to understand the caveats.
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Starting at version 4.0, F3 supports the platform FreeBSD. **Mac
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users:** Version 4.0 does not compile on Macs. The issue has been fixed
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on version 5.0.
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Starting at version 5.0, F3 includes ``f3probe`` and ``f3fix`` as
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experimental, and for Linux only.
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Starting at version 6.0, F3 includes ``f3brew`` as experimental, and for
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Linux only. Linux users may want to check out Vasiliy Kaygorodov's
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`page <https://serverissues.com/blog/2015/12/12/finding-out-chinese-flash-disk-slash-sdhc-card-real-size/>`__
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or Ahmed Essam's
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`page <https://ahmedspace.com/how-to-recover-a-corrupted-flash-memory-using-f3-tools-under-linux/>`__
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for help.
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Starting at version 7.0, ``f3probe``, ``f3fix``, and ``f3brew`` are stable.
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They are for Linux only.
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