HD Space Disappear

By codez13579
Oct 21, 2006
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  1. I recently bought a Seagate 320 gb HD & a WD 250 gb Hd. Both HD have lost gb of storage. The 320 GB now reads around 290 gb and the WD reads around 200 gb.

    Question:

    Why does it lose its space? How can I get my space back without reformatting?
  2. Rick

    Rick TechSpot Staff Posts: 6,304   +52 Staff Member

    That's the nature of how companies label storage capacities and we somehow accept it.

    Most of the lost space is due to rounding. A GB is actually 1,073,741,824 bytes, because there's about 1024 bits per KB. Drive manufacturers decided it is 'easier' to use 1,000,000,000 bytes to represent a GB. So for every GB of data, you lose around 75MB.

    In your case, 320(GB) x 75MB (Data lost because of rounding / GB) = 24GB, which works out to be pretty close to the amount of data missing from your 320GB drive. There's also some file system overhead too, much like a library needs an index of its books, which counts against the total available storage capacity.

    You shouldn't be missing 50GB from your 250GB drive though. If there's nothing important on it, you may want to consider repartitioning (Important!) and reformatting the drive. If you're using XP and it is a spare drive, you can Start > Run > diskmgmt.msc
  3. codez13579

    codez13579 Newcomer, in training Topic Starter Posts: 68

    thank you. i over exaggerated on the 250 gb. my 250 actually read 232.7 gb. using ur formula 250gb X 75mb = 18.750 gb to be lost. i lost 17.3 gb so i guess everthing is okay on that end too. thanks for the information. wow imagine a 500 gb u lost around 38 gb. ACCEPTED STANDARD......funny more like an ACCEPTABLE DECEIT.
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