Originally Posted by DCTneo
Not enabling Advanced Format could be why your imaging fails around 7 percent short (931 out of 1000 GB capacity).
The hard drive isn't really 1000 GB (Gigabytes) in size. It's 1000 GiB (Gibibytes) in size.
If I understand it correctly, GB is a decimal representation of the size, while GiB is a binary representation of that same size.
A GB = 10 to the power of 9, while a GiB = 2 to the power of 30.
So that works out to be:
1 Gibibyte = 10^9 bytes = 1,000,000,000 bytes
1 Gigabyte = 2^30 bytes = 1,073,741,824 bytes
I think the most misleading thing is that the HDD manufacturers don't use the term GiB, they use GB and add a disclaimer on their packaging that a GB = 1,000,000,000 bytes. ...so they're redefining the value of Gigabyte to equal Gibibyte, sort of moving the goal posts if you ask me.
There's some discussion of it over at overclockers.com
So the HDD manufacturers say that 1 "gigabyte" is 1,000,000,000 bytes, but the way operating systems report space shows the same thing requiring 1,073,741,824 bytes. So that's about 6.87% smaller than the measurement that the HDD manufacturers go by. Take 1000 GB x 6.87% and you get 68.7 MB. 1000 GB - 68.7 MB = 931.3 GB.
So my revision of the WD10EARS may be just a slight bit larger, perhaps 931.6 GB, which is getting rounded up to 932 GB.