On Mon, 15 Jun 2015, Tom Yan wrote: > I have a SanDisk Extreme USB Flash Drive > (http://www.sandisk.com/products/usb/drives/extreme/), which does NOT > support UASP so is running under "usb-storage". > > According to `hdparm`, it seems to supports TRIM; and according to > `sg3_opcodes`, it seems to support ATA Pass-Through (12/16). However, > all TRIM/DISCARD related ioctl doesn't work with it at all. > > So my question is, is TRIM/DISCARD possible at all in linux for usb > drives? If so, what are the requirements? If not, is it just not > implemented yet or an inherit problem of usb which cannot be fixed? This has nothing to do with USB. It's simply a question of whether or not that particular flash drive implements the command. Some drives do and and some don't. Alan Stern -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
