We recently saw that (at least some) XO-1.5 developer machines (C1, "ramp" units, etc) have SD cards that are significantly faster than what is being shipped to end users.
This was a surprise to me (and probably to a few more of us) -- we assumed that most dev machines had a similarly spec'ed SD card to the shipping machines. AIUI, we intended to have an assortment of "candidate" SD cards on the ramp units, the units I've seen all have pretty fast cards :-) This probably explains the scattered results of testing Record audio/video sync -- with lots of 'works for me' vs "definitely doesn't work". The slower SD cards are significantly slower. Deployments can request faster cards (at a cost), but I think it makes sense to test with the lowest common denominator. And we definitely need to understand what SD card is behind each "works" or "doesn't" report re Record and other write-intensive tasks. To aid clarity, Mitch has added a ".speed" test to OFW -- and we've timed a few cards with it: http://wiki.laptop.org/go/SD_and_USB_FLASH_Drive_Performance How to check your internal SD card brand & model: http://wiki.laptop.org/go/XO_Debugging_tips cheers, m -- [email protected] [email protected] -- School Server Architect - ask interesting questions - don't get distracted with shiny stuff - working code first - http://wiki.laptop.org/go/User:Martinlanghoff _______________________________________________ Devel mailing list [email protected] http://lists.laptop.org/listinfo/devel
