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