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If you bought a 640 GB hard drive when the drive is formatted it will be slightly smaller then the size listed on the box.
This is caused by a difference between the size of a GB as defined by windows versus the maker of the drive. The drive manufacture assumes that 1 GB is 1000 MB, where as windows assumes it is 1024 MB.
If you carry these assumptions all the way down to the byte level you get:
640GB = 640000 MB = 6.4 * 10^8 KB = 6.4 * 10^11 bytes
this is the base storage size of the drive.
Then windows takes this number and does the same in reverse to get the number of GB is displays:
6.4 *10^11 bytes = 6.25 * 10^8 KB = 610351 MB = 596.1 GB
There is nothing wrong with the drive, it's just a different unit of measurement.

Posted on May 25, 2011

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Here is a great website which discusses this is great detail.

In a nutshell, this is a rounding problem. The following shows how many KB in 1 MB, how many MB in 1GB, etc.

  • Kilobyte (KB) = 1,024 Bytes
  • MegaByte (MB) = 1,024 Kilobytes or 1,048,576 Bytes
  • Gigabyte (GB) = 1,024 Megabytes or 1,073,741,824 Bytes
  • Terabyte (TB) = 1,024 Gigabytes or 1,099,511,627,776 Bytes
Since the way that hard drive manufacturers and your operating system measure space don't agree, the way it addresses space varies by about 6.5%. (6.5% less than published size)
It does not indicate a problem with your hardware, and all hard drives (at least in a windows environment) have this issue.

Posted on May 25, 2011

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That's problem maybe your PC desktop system bios motherboard compatible only for 600gb. below or connect first to other PC desktop maybe have problem your 640gb.

Posted on May 25, 2011

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640 gb what? HDD? If thats the case then it may be damaged or not properly formatted for a windows computer. Check into formatting it, but be warned, doing so erases all the data on the drive.

Best of luck

Posted on May 25, 2011

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SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

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Posted on Jan 02, 2017

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Out of range

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10meter . is way too long. sorry. never do that ....
10m means that. why say 10m?
lead = cable. VGA cable. it is.
VGA will not run 10meters ever, and look ok, (i do know how)

out of range means the PC is using ******* resolutions settings
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