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On Thursday, 26 November 2020 00:10:00 GMT Michael wrote: |
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> On Wednesday, 25 November 2020 17:37:15 GMT Dr Rainer Woitok wrote: |
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> > Greetings, |
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> > |
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> > since my old 64 GB Verbatim USB sticks became too small, I bought two |
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> > new 128 GB Philips sticks. Because I need to read and write them on |
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> > both, a stand-alone Windows laptop (not connected to the internet) runn- |
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> > ing Windows Vista and Cygwin and my Gentoo laptop, I encrypted them with |
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> > old TrueCrypt on the Windows box, using them under Gentoo in TrueCrypt |
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> > compatibility mode. |
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> > |
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> > This worked well with the Verbatim USB sticks (which probably are USB |
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> > 2.0), but while reading the new USB 3.0 Philips USB sticks is signific- |
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> > antly faster than reading the old Verbatim USB sticks, writing to them |
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> > is slow as hell under Gentoo. And writing to the Philips USB sticks on |
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> > the old Vista laptop with USB 2.0 ports clearly outperforms writing to |
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> > them using the Gentoo laptop's USB 3.0 ports. |
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> > |
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> > This could be a problem with TrueCrypt/VeraCrypt or with somehow miscon- |
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> > figured USB ports. To check for the latter I provide below all kernel |
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> > configuration variables I regard USB related in the hope that some know- |
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> |
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> > ledgable people might find a glitch in there: |
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> Check dmesg to see if initialisation of the USB 3.0 drive throws up any |
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> errors. Then check 'lsusb -t' to make sure it has been recognised as a USB |
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> 3.0. |
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> |
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> If write operations without TrueCrypt/VeraCrypt are equally slow, then |
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> obviously the problem is not with encryption. |
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> |
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> I've read in a number of articles the erase block size on most USB flash |
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> (NAND) is 128KB, which incurs a lot of operations on a write, when using |
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> Linux with its 4K size sectors. Partitioning the USB drive to use 128KB |
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> sectors and then aligning the fs on it should improve matters. |
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> |
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> I found this article which mentions an experiment with ext4 fs. A more |
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> effective search should hopefully bring up examples on FAT fs. |
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> |
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> HTH. |
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Apologies, I seem to have forgotten to include the link. Here's another link |
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I came across today and which offers more detail on this topic: |
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http://wiki.laptop.org/go/How_to_Damage_a_FLASH_Storage_Device |
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