Quoting Erik Josefsson (2019-06-23 15:42:05) > On 6/23/19 8:40 AM, Jonas Smedegaard wrote: > >> If random IO speed most likely is the real bottle neck, do you know > >> of any particular brand/label/kind/category of MicroSD card that is > >> significantly better than others in that regard? > > https://github.com/ThomasKaiser/Knowledge/blob/master/articles/A1_and_A2_rated_SD_cards.md > > > > (this is perhaps 5th time I share that link with you; 2nd on this > > list) > > The article by Thomas Kaiser ends with an open discussion that you can > probably just as well buy A1 cards made before 2017.
You call a section labeled "TODO" an open discussion? Oh well. > The last card I bought is neither A1 or A2 but marked with a XC II > logo. That particular markup is not mentioned in Kaiser's article. Maybe because the text is about A1/A2 classification, only briefly linking to the historic thread covering lesser relevant cards. > So the article cannot tell me which of my 4 cards is likely to be the > best for my usecase: > > MicroSD SanDisk Extreme PRO 64GB [3] XC II > MicroSD SanDisk Extreme PLUS 64GB [3] XC I V30 A2 > MicroSD SanDisk Extreme PLUS 32GB [3] HC I V30 A1 > MicroSD SanDisk Ultra 32GB [1] HC I (10) A1 The section "'Application Performance Class' to the rescue" didn't help tell you about the relevancy of A1/A2 classification? And subsection "Real world 2018 A1 and A2 performance comparison" didn't help tell you about real-world relevancy of A1 versus A2 classification? Oh well. > Ahh.. there's another hint! For some applications, disk partition > matters? Explained here (yes, shared a few posts ago as well): https://wiki.gentoo.org/wiki/SDCard#Solution_2:_Tuned_ext4 https://thelastmaimou.wordpress.com/2013/05/04/magic-soup-ext4-with-ssd-stripes-and-strides/ https://lists.linaro.org/pipermail/flashbench-results/2014-July/000479.html - Jonas -- * Jonas Smedegaard - idealist & Internet-arkitekt * Tlf.: +45 40843136 Website: http://dr.jones.dk/ [x] quote me freely [ ] ask before reusing [ ] keep private
signature.asc
Description: signature
