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Windows 7: my 750 GB HD shows only 698 GB

18 Oct 2011   #1

 
 
my 750 GB HD shows only 698 GB

Hi, I just got a new HD and tried to just plug it in on my old HD with Windows 7 but I can't find it anywhere no meter that it get recognized and installed at the beginning, I tried to install my old XP and it shows only 698 GB on the other hand Windows 7 shows 715GB.This HD is 750GB.And shouldn't those anti static bags that they(HD) are packed be closed hermetical instead this HD was with a bag that was just folded and glued with duck tape (made of paper) with a "made in china" letters!

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18 Oct 2011   #2
Arc

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium 64 Bit SP 1
 
 

698GB = 714,752 MB = 731,906,048 KB = 749,471,793,152 B

I hope it is normal.
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18 Oct 2011   #3

Windows 7 Professional SP1 32-bit
 
 

It's one of the oldest marketing tricks in the book...harddisk manufacturers round their numbers on a 1:1000 basis, i.e. your HD really holds 750,000,000,000 bytes - which to them means 750,000,000 KB or 750,000 MB or 750 GB.

But one KB really is 1024 bytes, one MB is 1024 KB and one GB is 1024 MB. So the actual size of your harddisk comes out to 750,000,000,000 byes = 732,421,875 KB = about 715,255 MB = about 698 GB.

Windows XP's setup was showing you the correct size. I'm surprised that the Windows 7 install would show 715GB, unless for some weird reason it took the amount of 715,255MB and just made 715GB out of it by chopping the lower 3 digits off. (That would really surprise me though and might even be a bug, albeit a harmless one.)

Regarding the antistatic bag, no worries. I've bought a lot of new HDs over time and some came completely sealed, some just with a flap and tape. And many drives are manufactured in Malaysia and similar places, that's normal.
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18 Oct 2011   #4

Windows 8.1 Pro
 
 

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18 Oct 2011   #5
Arc

Microsoft Community Contributor Award Recipient

Windows 7 Home Premium 64 Bit SP 1
 
 

Quote   Quote: Originally Posted by Corazon View Post

I'm surprised that the Windows 7 install would show 715GB
There may be a reason , I guess
Quote:
Capacity - 750GB unformatted / 715GB Formatted
source : Seagate Momentus 750GB Review (ST9750420AS) | StorageReview.com
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18 Oct 2011   #6

Windows 7 Professional SP1 32-bit
 
 

Aha. That capacity quote is misleading, though, since it assumes an actual capacity of 750GB which we've already disproven - otherwise, the drive would really have 805,306,368,000 bytes of storage space.

However, it is true that the formatted capacity will be even less, since every filesystem (not just NTFS) uses a small amount of the partition space for its own metadata. It's not much at all though, so on a 698GB partition you can probably expect roughly 697GB of free space available to you.
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18 Oct 2011   #7
mjf

Windows 7x64 Home Premium SP1
 
 

I'm still puzzled (just curious actually). The review says that but I don't see it on the Seagate spec sheet. All my disks in disk management read the raw bytes just taking the binary conversion into account. I don't know what formatting has got to do with it. What you stick on the disk (eg. file system) is up to you.
Sometimes 1 TB might be slightly larger than 1x10^9 bytes.
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18 Oct 2011   #8

 
 

CORASON "Windows XP's setup was showing you the correct size. I'm surprised that the Windows 7 install would show 715GB, unless for some weird reason it took the amount of 715,255MB and just made 715GB out of it by chopping the lower 3 digits off. (That would really surprise me though and might even be a bug, albeit a harmless one.)"

Ok, this, about a bug, can you elaborate more, please?Is it possible that a brand new HD have bugs or you meant that my Windows 7 has a bug?!
I must say, I'm quite disappointed, you buy 750gb and get 50gb less, thats very stupid, its 50gb, isn't better just to say the truth and not lie, I mean if they lie about the capacity than what are they lying more about?
And what about the installation? why couldn't I find the new HD?It wouldn't show on "my computer" how am I suppose to find it.I want to use this HD as storage like one partition using my old HD and its Windows 7 I can't buy another Windows 7.
And just one more question: how do you calculate how much do you actually get from HD of 750gb?
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18 Oct 2011   #9

Win 7 Pro x64
 
 

If you will look at the fine print on the packaging the HD came in, it will probably say something to the effect: 1GB = 1,000,000,000 bytes. If so, they're not lying. Even if it's not there, they have been pulling this trick for at least 20 years - it's become "common knowledge."

750,000,000,000 bytes = 698.49 REAL gigabytes

The "bug" referred to isn't really a bug. All he was saying was that Windows might have been programmed by Microsoft to show a less than accurate number.
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18 Oct 2011   #10

Microsoft Community Contributor Award Recipient

Windows 7 Ultimate SP1 X64 (Windows 8.1, Linux Mint, Windows XP and others in VM)
 
 

Advertised vs actual size of hard drives
To make it simple advertised size is the GB advertised X 0.9313226 = actual size
In your case advertised size 750GB X 0.9313226 = 698.49195GB
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 my 750 GB HD shows only 698 GB




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