Same HDDs different speed?!

Dmitri Vladimir

Honorable
Mar 28, 2013
38
0
10,530
According to Dxtory my two identical harddrives have different speeds.
They are both a Samsung HD502IJ

D: has 88mb/sec - has a couple of programfiles, less than 1GB

E: has 65mb/sec - has no files!!!

How is that possible?