On Jun 9, 2014, at 1:37 PM, Wolfgang Denk <wd@xxxxxxx> wrote: > Dear Chris, > > In message <0E76B97E-96DF-43A3-B8EC-4867964BF8E9@xxxxxxxxxxxxxxxxx> you wrote: >> >> # dd if=/dev/zero of=/dev/sda seek=430234064 count=8 oflag=direct >> 8+0 records in >> 8+0 records out >> 4096 bytes (4.1 kB) copied, 3.73824 s, 1.1 kB/s > > This has been pointed out before - if this is a 4k sector drive, then > you should really write in units of 4 k, not 8 x 512 bytes as you do > here. It worked so, why? The drive interface only accepts LBAs based on 512 byte sectors, so bs=512 count=8 is the same as bs=4096 count=1, it has to get translated into 512 byte LBAs regardless. If it were a 4096 byte logical sector drive I'd agree. Chris Murphy-- To unsubscribe from this list: send the line "unsubscribe linux-raid" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
