All hard drives including Transcend StoreJet series will display a less memory capacity on a computer than stated. The discrepancy is resulted from the way hard drive manufacturers calculate the megabyte of memory.
Windows calculates a megabyte (or 1,000x1,000 bytes) as 1,000KBs, when in fact the correct calculation is 1,024KBs. So, for a 320GB hard drive, Windows will calculate it as having a capacity of 298GB (320,000,000,000/1,024/1,024/1,024=298GB).
The differences between the actual capacity shown on the computer and stated on the package are shown as below.
On package On PC