[Steve McIntyre] > You're not measuring the time taken to sync to the flash drive > either, so all you're going to be seeing is the speed of writing to > cache.
Huh, I figured the 'sync' call at the end of each test run covered that. > I've done lots of work with USB flash and MMC/SD cards over the last > few years, and the best results are typically achieved using "dd > bs=4M oflag=sync". That way, you'll normally get nicely-aligned date > writes big enough to cover the internal flash page size and remove > the horrendous effects of read-modify-write cycles. Not noticeable in my test runs, so maybe I have an abnormal flash disk. (The fact that it has a USB interface, rather than something closer to the flash controller, probably makes a difference.) Anyway, I've never been against people recommending things like "dd bs=4M oflag=sync" when writing to disk media. My pet peeve is when people recommend "dd" but without any options other than if= and of=. It is clear that many such people don't have a clue _why_ they use dd, except an irrational, dare I say cargo-cult, aversion to cp with block devices. -- To UNSUBSCRIBE, email to debian-boot-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org Archive: http://lists.debian.org/20120516220409.gg2...@p12n.org
