Why it shows 152 GB instead of 160 GB?

[Aanand]

Though I bought a HDD with 160 GB capacity it shows only 152 GB. What could have happened to the remaining 8 GB? It shows 160 GB in the BIOS.

[shwetanshu]

windows calculates 1 GB= 1024 MB
HDD makers calculate 1 GB= 1000 MB

thats y

[anandk]

Originally Posted by shwetanshu

windows calculates 1 GB= 1024 MB
HDD makers calculate 1 GB= 1000 MB
thats y

thnx. i didnt no that !

[Kniwor]

ok (160*1000)/1024 = 156.25 Gb....

So where is the extra 4.25Gb...

Actually there are 2 reasons...
one is that which is stated above...

another is ur filesystem.... everyfilesystem has some header etc as i believe... so i dont think entire space is usable... but that's my interpretation...

[sakumar79]

Actually, you should be calculating 160*1000*1000/1024/1024=152.587890625 because HDD makes also consider 1KB as 1000Bytes... whereas in Windows 1KB=1024 bytes... the 1024 is actually used because it is 2 raised to the power of 10... HDD manufacturers make use of the fact that it is close to 1000.


Arun

[shwetanshu]

@skumar said it right, i thought that if i just mentioned that it wud have helped, gues i shud have explained full procedure

[ishaan]

shwetanshu is rite about the 1000 and 1024 thing..but dont only calculate 1024 mb,,,even the kbs and bytes are 1024 wich they rite as 1000 so u gotta calculate rite from d BITS

but SONY is cool...if u buy memory sticks, etc and u read the box, it says how much actual memory u get...like according to 1024..

[Kniwor]

Originally Posted by sakumar79

Actually, you should be calculating 160*1000*1000/1024/1024=152.587890625 because HDD makes also consider 1KB as 1000Bytes... whereas in Windows 1KB=1024 bytes... the 1024 is actually used because it is 2 raised to the power of 10... HDD manufacturers make use of the fact that it is close to 1000.


Arun

wow... thanks...

I was thinking that the headers are created after the partition is formatted and was a bit confused and hence added that it was what i thought...

anyhow thanks....

[theraven]

ishaan buddy u dun have to calculate from the bits
only from the bytes => kB
since 8 bits is one byte and thats standard both for manufactures and windows

[ashnik]

SONY makes mem?

[dIgItaL_BrAt]

He means the Sony Memory Stick (Pro,Duo whatever...) range.