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Windows 7: 1.5TB hard disk shows 1360GB

22 Dec 2009   #1

Windows 7 Ultimate 64bit SP1
 
 
1.5TB hard disk shows 1360GB

1.5TB hard disk shows 1360GB,why?
The disk is empty/delete partition formated/create partition/EMPTY.
OS Windows 7 ultimate 64bit.

My System SpecsSystem Spec
.

22 Dec 2009   #2

Windows 7 Professional x64
 
 

Hello,

That space is a discrepancy between manufacturer claims and real storage space. You hard drive is not 1500 GB, as perceived by the OS. It is less, and when you subtract the space of the format, the available space decreases.

So, what you are experiencing is normal.
My System SpecsSystem Spec
22 Dec 2009   #3

W7 X-64 W8.1 X-64 Opensuse 13.1 W2003 Server
 
 

Hi there

There's been LOADS of threads on this issue.

Computer memory is actually shown in 1KB (1024 byte) sizes
On Discs memory is actually shown (By the MANUFACTURER) in REAL size where 1KB = 1000 bytes.

So your 1.5TB disk which is actually 1.5 X 1000 X 1000 Bytes will be shown slightly less in the computer by Windows as it will measure free space in 1024 byte chunks.

(Don't forget also some size is used by the Windows file sysytem so even in this case your expected size will be a little less than the actual size).

Cheers
jimbo
My System SpecsSystem Spec
.


22 Dec 2009   #4
jav

Windows 7 Ultimate x86 SP1
 
 

Terabyte - Wikipedia, the free encyclopedia

Quote:
*In standard SI usage, 1 terabyte (TB) equals 1000000000000bytes = 1000^4 or 10^12 bytes.
*Using the traditional binary interpretation, a terabyte is 1099511627776bytes = 1024^4 = 2^40 bytes = 1 tebibyte (TiB).

The capacities of computer storage devices are typically specified using their the standard SI meaning of unit prefixes, but many operating systems and applications report in binary-based units. Mac OS X 10.6 (Snow Leopard) reports decimal units
The first one is decimical interpretation which is used by hardware manufacturers.
Second one is Binary interpretation which is used by many Operating systems.

As you can see difference on your exemple is:
1,5*1000^4 vs 1,5*1024^4
OR
1 500 000 000 000 vs 1 649 267 441 664

So manufacturer shows (TB) and OS shows (TiB)

Conclusion:
At the end 1500000000000 bytes (which your manufactures thinks 1,5 TB) is approximately 1396 GiB (although it says GB) for your OS
My System SpecsSystem Spec
22 Dec 2009   #5

Windows 7 Ultimate 64bit SP1
 
 

Just a tip..
In bios shows 1500GB
In Computer Management/Disk Management shows 1397,26
In Computer shows 1360GB
-------------------------------------
MY Computer
C:/velociraptor 150GB
D:/1360GB
E:/1360GB
My System SpecsSystem Spec
22 Dec 2009   #6
jav

Windows 7 Ultimate x86 SP1
 
 

Quote   Quote: Originally Posted by panais View Post
Just a tip..
In bios shows 1500GB
In Computer Management/Disk Management shows 1397,26
In Computer shows 1360GB
-------------------------------------
MY Computer
C:/velociraptor 150GB
D:/1360GB
E:/1360GB
That's it see.

1. BIOS dosen't depend on OS so it shows with the manufacturer's point of view (1500 GB = 1,5 TB)

2. Computer Management shows as According to binary rules, if you look at my calculations it show the same number 1397 GiB (but it will anyway say GB)

3. And windows has some hidden important OS files, to which even you don't have access (as you are limited Administrator), so it will not show you and you can't even see what size they are. With 3rd party programmes maybe. So some size of your HD spent there and not shown to you.

And some space used for Shadow copies of the Windows.

And then there is a file system, (in your case NTFS) cluster size and so on.(If you really interested: Simple explanation for cluster size: http://en.wikipedia.org/wiki/Cluster_size (so you will understand why they play some role on wasted space aswell)

That's why Windows will show you less HD size (1360 GiB)


Hope you understand what I meant.
My System SpecsSystem Spec
22 Dec 2009   #7

Windows 7 Ultimate 64bit SP1
 
 

Quote   Quote: Originally Posted by jav View Post
Quote   Quote: Originally Posted by panais View Post
Just a tip..
In bios shows 1500GB
In Computer Management/Disk Management shows 1397,26
In Computer shows 1360GB
-------------------------------------
MY Computer
C:/velociraptor 150GB
D:/1360GB
E:/1360GB
That's it see.

1. BIOS dosen't depend on OS so it shows with the manufacturer's point of view (1500 GB = 1,5 TB)

2. Computer Management shows as According to binary rules, if you look at my calculations it show the same number 1397 GiB (but it will anyway say GB)

3. And windows has some hidden important OS files, to which even you don't have access (as you are limited Administrator), so it will not show you and you can't even see what size they are. With 3rd party programmes maybe. So some size of your HD spent there and not shown to you.

And some space used for Shadow copies of the Windows.

And then there is a file system, (in your case NTFS) cluster size and so on.(If you really interested: Simple explanation for cluster size: Data cluster - Wikipedia, the free encyclopedia (so you will understand why they play some role on wasted space aswell)

That's why Windows will show you less HD size (1360 GiB)


Hope you understand what I meant.
Yes i understand,thanks.
----------------------------
Its fun for me to watch the <<unchanged>> capacity of my 2 new hard disks.
I transfer everything i have in them,and the disks are almost empty.
My System SpecsSystem Spec
23 Dec 2009   #8

windows 7 ultimate x64
 
 

its always like this,there is nothing abnormal in it or hdd manfacturer didnt bluff u...its normal what u r facing,and it should happen too.on fat32 it is less and on ntfs it is more...
if u find a hdd 1.5tb and it is showing 1.5tb,there are 2 possibilities..
1.u havnt formatted it... :P
2.u r sleeping and trying to see 1.5tb as 1.5tb in dream
My System SpecsSystem Spec
23 Dec 2009   #9

 

Quote   Quote: Originally Posted by panais View Post
1.5TB hard disk shows 1360GB,why?
The disk is empty/delete partition formated/create partition/EMPTY.
OS Windows 7 ultimate 64bit.
Welcom Panais to the Windows 7 Support forum.
The discrepancy you see on space reporting is due to many factors.
If your drive is the main C: drive the operating system will partition space for the installation of the OS, cab files, dll files etc. These are necessary files for the OS to function, these files are allocated on your drive and take between space.
My System SpecsSystem Spec
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 1.5TB hard disk shows 1360GB




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