All hard drives including Transcend StoreJet series will display a less memory capacity on a computer than stated. The discrepancy results 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
160GB 149GB
250GB 232GB
320GB 298GB
500GB 465GB
640GB 596GB
750GB 698GB
1TB 931GB
1.5TB 1397GB
2TB 1863GB