Und hier noch ein Auszug aus den Faq's:
http://www.storage.ibm.com/techsup/h...hddfaqs.htm#11
Why is my new IBM drive showing a reduced capacity after formatting?
There are two different number systems which are used to express units of storage capacity; binary in which a kilobyte is equal to 1024 bytes, and decimal in which a kilobyte is equal to 1000 bytes. The storage industry standard is to display capacity in decimal, but some programs measure the capacity of a drive in binary.
Measurement Binary Decimal
Kilobyte (KB) 1,024 1,000
Megabyte (MB) 1,048,576 1,000,000
Gigabyte (GB) 1,073,741,824 1,000,000,000
Terabyte (TB) 1,099,511,627,776 1,000,000,000,000