Maybe this will help you. Remember also that the PS3 uses some of it in addition to this for its OS.

Determining drive capacity can be confusing at times because of the different measurement standards that are often used. When dealing with Windows and Mac based systems, you will commonly see both decimal measurements and binary measurements of a drive's capacity. In either case, a drive's capacity is measured by using the total number of bytes available on the drive. As long as the drive displays the correct number of bytes (approximate), you are getting the drive's full capacity.

Decimal vs. Binary:
For simplicity and consistency, hard drive manufacturers define a megabyte as 1,000,000 bytes and a gigabyte as 1,000,000,000 bytes. This is a decimal (base 10) measurement and is the industry standard. However, certain system BIOSs, FDISK and Windows define a megabyte as 1,048,576 bytes and a gigabyte as 1,073,741,824 bytes. Mac systems also use these values. These are binary (base 2) measurements.

To Determine Decimal Capacity:
A decimal capacity is determined by dividing the total number of bytes, by the number of bytes per gigabyte (1,000,000,000 using base 10).

To Determine Binary Capacity:
A binary capacity is determined by dividing the total number of bytes, by the number of bytes per gigabyte (1,073,741,824 using base 2).

This is why different utilities will report different capacities for the same drive. The number of bytes is the same, but a different number of bytes is used to make a megabyte and a gigabyte. This is similar to the difference between 0 degrees Celsius and 32 degrees Fahrenheit. It is the same temperature, but will be reported differently depending on the scale you are using.

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Various Drive Sizes and their Binary and Decimal Capacities

Drive Size--------Approximate--------Decimal Capacity--------Approx Binary Capacity
in GB--------------Total Bytes------(bytes/1,000,000,000)-----(bytes/1,073,724,841)
10 GB-------------10,000,000,000------------10 GB------------------------9.31 GB
20 GB-------------20,000,000,000------------20 GB------------------------18.63 GB
30 GB-------------30,000,000,000------------30 GB------------------------27.94 GB
40 GB-------------40,000,000,000------------40 GB------------------------37.25 GB
60 GB-------------60,000,000,000------------60 GB------------------------55.88 GB
80 GB-------------80,000,000,000------------80 GB------------------------74.51 GB
100 GB-----------100,000,000,000-----------100 GB------------------------93.13 GB
120 GB-----------120,000,000,000-----------120 GB-----------------------111.76 GB
160 GB-----------160,000,000,000-----------160 GB-----------------------149.01 GB
180 GB-----------180,000,000,000-----------180 GB-----------------------167.64 GB
200 GB-----------200,000,000,000-----------200 GB-----------------------186.26 GB
250 GB-----------250,000,000,000-----------250 GB-----------------------232.83 GB

[QUOTE="jasonpugh"]I wish 200Gig ment 200 free gigs of space. That should be false advertisement.Threesixtyci

Well... just the way it is. Box always rounds down to use 1000 as the conversion factor, where as software defines 1024 as the conversion factor. It's always been like that.

I know that's the way it is but you would honestly think that they would use that conversion factor to give you the actual amount being advertised on the box. I'm just saying that would be nice.

How do you install the OS onto the new drive? stuartcee

As soon as the system is powered on it will recgonize that the drive needs formatting.

I managed to strip all four screws and not one of them budged an inch :( now my new 160 gb hdd is just an external hdd :(AlienOverlord

I'm very sorry to hear that. I used a precision screw driver and had the right size for the screw. I build my own PCs so I'm not a momo when it comes to these things. My screws were just a PITA. When I put them back in I left them a litttle loose so I don't run into that problem again. That is if I ever need to upgrade again. I'm sure my 159Gigs I have left will last a while.

Becasue aside from the filesystem you never get the full capacity. No big deal, I'm just saying for instance, if they sell a 200gig drive then it should be a 215gig drive so you get the full 200 gig to use as space. That would be cool.