One of the key things I'm thinking about is, independent of total space 
on the drive, it looks like physical sector sizes larger than 512b may 
be all that is available at some point in the not too distant future. Of 
course the drives will continue to appear as 512b to OSs/apps that don't 
know how to check for the underlying physical sector size.
The problem is that there can be very significant performance penalties 
to treating a disk with physical sector sizes of 4k as if they are 512b 
due to potential read/modify/write actions needed when write operations 
cross physical sector boundaries. Reads can also see a hit if they are 
unnecessarily crossing those boundaries as well.
Making sure to partition on 4k boundaries certainly is critical, but 
does not in itself fix the underlying issue.

Not that I'm calling for a ground-up re-write of the OS, just wondering 
what people have planned when actual 512b physical sector disks become 
unavailable.


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