HELP!: Win XP says my 80gb is only 74.5gb

By john spanky ยท 28 replies
Jan 21, 2004
  1. (my hardrive: 80gb segate baracuda)
    Its my first time to use partition magic 8 and I was unaware of what i was doing...

    during my first run i tried to create a new partition on my was then that i noticed a gray icon below my main partition---it says unallocated..not knowing what the heck "unallocated partition" was i continued on creating a partition.(ignoring the unallocated one)...everything went fine..then suddenly i decided to merge the partition i created (it was roughly about 30gb)..again the process was a success.

    but the one thing that bothers me now is that my hardrive is not showing up a full 80gb of hardisk space (even in partition magic my drive only displays 74.5gb)...there was no hidden partition to be found what so question is were did the rest of my hardrive space go???? does it have something to do with the unallocated space i ignored before i created a new partition???

    I was playing around with partition magic then suddenly i found this resizing cluster option so i went there the check what it was about...there i saw a bunch of wasted clusters...i tried to sum it up...and its around 5 +/- gb. is this my missing partition???
  2. Greeno

    Greeno TS Rookie Posts: 281

    From within My Computer, if you Right click on the drive and choose properties, what does it state there?

    I have a Maxtor 80GB thats

    Capacity : 81,948,430,336 but also, 76.3GB

    You sure you're just not confused by the whole :-

    1MB = 1024Kb etc..
  3. Spike

    Spike TS Evangelist Posts: 2,168

    There's nothing wrong!!!

    I can't remember the explanation for it, but believe it or not, floppy disks have the same strange size difference.

    In terms of hard disk space, If I remember my figures correctly, you loose about 0.4 GB of space per 10GB of the stated size...

    eg, a 10 GB drive is acctually about 9.6 GB in terms of usable space. You can take that as read if you like, but I dare say that someone here can remember the full reason and figures for it.
  4. Greeno

    Greeno TS Rookie Posts: 281


    1024Bytes = 1kiloByte (1kB)
    1024kB = 1MegaByte (1MB)
    1024MB = 1GigaByte (1GB)
    1024GB = 1TeraByte (1TB)
  5. Spike

    Spike TS Evangelist Posts: 2,168

    Could you please post in more detail why a 10 GB drive is only 9.6GB useable? I already knew the 8 bits=1byte, 1024 bytes=1KB, etc, etc.

    But I can't remember how partition sizes etc go together with that information resulting in a 10 GB drive only having 9.6 GB of useable space.
  6. Greeno

    Greeno TS Rookie Posts: 281

    9.6something... x 1.024 = 9,830

    so it prolly works out about right..
  7. john spanky

    john spanky TS Rookie Topic Starter

    How come my drive shows up only as 80,023,715,840???

    Attached Files:

  8. john spanky

    john spanky TS Rookie Topic Starter

    Hey guys you sure that the dispcrepancy on my drive space isnt caused by the wasted cluster space that partition magic is showing????

    Attached Files:

  9. Nightly

    Nightly TS Rookie

    Hard Drive makers says 1 gig is 1 gig, the os uses 1 gig as 1024mg. Thats why their is a difference in the size that the os reports.
  10. Nightly

    Nightly TS Rookie

    oops not mg, 1024MB
  11. john spanky

    john spanky TS Rookie Topic Starter

    Do you think its safe if i try to resize my cluster with partition magic???
  12. RealBlackStuff

    RealBlackStuff TS Rookie Posts: 6,503

    Don't mess about unnecessarily with any parameters you find in whatever program. Best leave them alone. It is cheaper to buy another HD than having to reinstall/repair a running installation, just because you want the last GB out of it.
  13. SNGX1275

    SNGX1275 TS Forces Special Posts: 10,742   +421

    Um, john spanky - your HD size checks out just like it should, actually if you look at your properties you HD holds more than what it should (by way of published manufacturer size). Its got over 80 billion bytes, so no need to complain, thats all you are going to get out of it. People have in this thread explained to you this 1024 thing before going to the next classification, why don't you just accept thats how it is, and how its always been, and how it always will be?
  14. StormBringer

    StormBringer TS Maniac Posts: 2,244

    You aren't going to gain any additional space by doing it, you'll only increase/decrease the amount of space that is used by chunks of data. More info on cluster size can be found HERE
  15. filthy_mcnasty

    filthy_mcnasty TS Rookie Posts: 78

    a computer is ultimately a counting machine. nothing more nothing less. it's all ones and zeros.

    drive sizes and actual kilobytes are defined in terms of binary numbers and not regular base ten as you are used to. unfortunately hard drive manufacturers dont use this same convention *they want to make it sound like more, obviously*

    2^10 = 1024 = 1 kb
    2^20 = 1048576 = 1 mb
    2^30 = 1073741824 = 1 gb

    so you would think your 10 gb hard drive can hold 10737418240 bytes but like i said, they dont name like this.
    a "10 gb" hard drive is really 9.76gb as someone previously said.

    so take your 74.5 gb and multiply by 1.024^3 and boom you have 80gb (we're working in terms of gb now so it's 3 not 30). your HD didn't just disappear or anything.

    if i remember correctly *and i do* someone filed a lawsuit against some HD companies because they said it was false advertisement to label drives the way they do.
  16. ptitterington

    ptitterington TS Maniac Posts: 255

    Sorry to press the point,
    but I have been doing the maths and I think that partition magic 7 has lost a bit, should a new sata 120gig seagate show as 111gb.

    I only used partition 7 as I just could not get disc manager to load.
    It just got so far and stayed as a blinking cursor for ever.
    Before I use it any tips appreciated.
    Thanks all
  17. Greeno

    Greeno TS Rookie Posts: 281

    yeah... i think thats right to be honest
  18. filthy_mcnasty

    filthy_mcnasty TS Rookie Posts: 78

    look at the factor i posted in my last reply.

    111 * 1.024^3 = 119.1853

    i'm willing to bet the discrepancy is that it doesn't show EXACTLY 111 gb, probably more like 111.75
  19. ptitterington

    ptitterington TS Maniac Posts: 255

    I just suppose i didnot want to believe it
    Thanks:mad: :grinthumb
  20. ptitterington

    ptitterington TS Maniac Posts: 255

    One other query?

    do different manufacturers calculate their drives differently.
    I was just looking at the sizes shown on this pc.

    c maxtor 40 gig 37.2

    D +F maxtor 120gig 19.5 +94.9 =114.4

    K seagate 120gig = 111

    odd I say
  21. Rick

    Rick TechSpot Staff Posts: 4,572   +65

    Each drive is made differently and will vary in size.

    It's marketing lies.. But it is something we'll have to live with for the time being.

    Honestly, when you buy a 80GB drive and have 74GB available, there's really not much to complain about. ;) That's still plenty of space.
  22. ptitterington

    ptitterington TS Maniac Posts: 255

    well i thought my old 4 gig was huge yet I have just added the second 120gig as it is amazing how film editing eats it up.

    Mind I paid more for the 4 gig than i just spent on the 120.
  23. rhoda

    rhoda TS Rookie

    I had a the same incident with my Sony VAIO

    The size of the partition identified is the Recovery Drive (5GB) cannot be changed & is not available for use. This dedicated partition of your hard disk drive enables the recovery of your system.
  24. SornyPanafonic

    SornyPanafonic TS Rookie Posts: 129

    i also have a 80 gig hd and it comes out to 74.5 gig of space. its like when companies keep the same box size but lower its content so the consumer never knows theyre being jipped or at least catches on - i would like to think that we ALL know we're being jipped by big bussiness. and no im not paranoid...who said im paranoid.... im not paranoid....AAAAAAAAAHHH!! haha...
  25. Liquidlen

    Liquidlen TechSpot Paladin Posts: 1,094

    At the lumber company you will pay to buy a 2X4 . It's actual dimension is 1.5"X 3.5"
    Get over it!
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