On 02/06/11 1:14 PM, Les Mikesell wrote: > Does anyone know if 4k sectors will be handled better by the kernel in Centos6? > I'd like to copy backups to a 750Gb laptop type drive for offsite storage but > the best write speed I can get is about 8MB/sec even with dd to the raw disk > which shouldn't have an issue with partition alignment. what are you using on dd as the blocksize (bs=) ? should be a fairly large multiple of 4K, like 1048576 (eg, 1MB writes). I get 50-80MB/sec writes to a laptop drive hooked up to my windows desktop when I'm cloning said laptop drives. if you're only seeing 8MB, something is very wrong.