> how will I arrive at block size of 4k On Linux platforms, you may want to look at "blockdev --getss /dev/nvme0n1" to determine the sector size of your device. Various other blockdev options will report various other device parameters. Regards, Jeff ��.n��������+%������w��{.n�������^n�r������&��z�ޗ�zf���h���~����������_��+v���)ߣ�