I have just purchased two Western Digital WD20EARS disks and discovered that they incorrectly report their physical sector size to the OS as 512 bytes, even though the specs suggest they have 4k sectors.
If I proceed to correctly align my partitions on this disk, do I need to perform any additional configuration to tell the filesystem that all write operations must be multiples of 4k, and only on 4k boundaries? Or can I just make sure my filesystem block size is a multiple of 4k, and all will be well? (As in, I won't encounter any read-modify-write operations done by the drive firmware.)
I am running Linux and plan to use software RAID0 + ext4, but information for other OSes and filesystems would be interesting too.