[GTALUG] Re: block size for dd -- no difference

On 2025-09-03 07:41, Mauro Souza via Talk wrote:

Try this: dd if=/dev/sda of=/dev/sdi bs=$i iflag=direct oflag=direct,nocache status=progress It seems you can't combine 'direct' and 'nocache', and I skipped 'status' because I won't be in front of monitor. So, I did.

dd if=/dev/sda of=/dev/sdi bs=$i iflag=direct oflag=direct And the result is 1K 18.8 MB/s 4K 51.1 16K 86.9 64K 93.3 256K 103 1M 107 4M 107 16M 105 64M 106 256M 99.1 It seems 1M-8M is the optimum. Just as well, because it's also the shortest to type. :-)