Calvin said:
I had trouble installing windows XP after using Norton
Ghost. Now only part of my 80 gig drive is formated
leaving 74 g's unformated and unusable. Need help to
make drive usable without reinstalling windows.
Thanks
74GB is the entire drive. All HD manufacturers take a GB to be 1 billion
bytes - whereas in computer language it's 1,073,741,824.
There are two definitions of a KB (that's kilobyte). A hard drive
manufacturer defines it as 1000 bytes, but the computer's value is 1024
bytes (this is because it's 2 to the power of 10 - that's 2 multiplied by
itself 10 times. Why 2 to the 10? Because 1024 in binary is 1 followed by 10
zeroes - also 10 converted from binary to decimal is 2).
Anyway, I digress...Back to your 'problem'. Look at the definitions below: -
Manufacturer (Decimal) Sizes
-----------------------------------
Kilobyte (KB) = 1000 bytes
Megabyte (MB) = 1000KB
Gigabyte (GB) = 1000MB
Computer (Binary) Sizes
----------------------------
Kilobyte = 1024 bytes
Megabyte = 1024KB
Gigabyte = 1024MB
Now look at the maths below
A decimal GB = 1000x1000x1000 = 1,000,000,000 bytes
A binary (what the computer 'sees') GB = 1024x1024x1024 = 1,073,741,824
bytes
Now you have an 80GB drive.
The manufacturer will tell you that your drive is 80,000,000,000 bytes. Now,
as you can see from the above figures, this cannot possibly be true.
The true value is 85,899,345,920 bytes or 85.9GB to one decimal place. Now,
this couldn't possibly fit on a drive of 80,000,000,000 bytes, so we have to
subtract 5.9GB (the difference) from the manufacturer's 80GB to make it fit.
This leaves you with an actual size of 74.1GB.
You can work out the true capacity of any drive by using this simple
formula.
The real capacity of any drive is the manufacturer's capacity less 7.5% of
that capacity.