Shellness;547229 Wrote: 
> 
> - 2) both SDA & SDB are 1Tb yet the size is shown as 916Gb & 902 Gb
> respectively – I’ve lost nearly 100Gb per HDD
> 

No you haven't.

Drive makers mean '1,000,000,000,000' when they say it is a terabyte.

Computers like powers of 2, not 10.  So, 916Gb = 916 *1024 *1024 *1024
or 983547510784, which is well over half the 'lost' space.  Add in
filesystem stuff (even an empty drive has portions reserved for
directory structure type information.. on Linux this is an 'inode'
which contains pointers to where the data is.  inodes take space even
if unused.  (try "df -i").

So, yeah all the data is there.  You're just dealing with drive vendor
who always seem to think computers are base-10 devices, or perhaps the
OS that thinks drives should always be based on base-2 since block
sizes on the driver are powers of 2.


-- 
snarlydwarf
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