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WINDOWS WILL NOT RECOGNIZE MY 640 GB ONLY 600 GB

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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.
http://www.ussscctv.com/harddrivesizecapacitiescalculator.aspx

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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Posted on Jan 02, 2017

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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.
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out of range means the PC is using ******* resolutions settings
on this old monitor. see list of legal resolutions below.

the answer is simple.. (NOT REALLY WITH NO PC OR OS STATED)
in your unstated PC and OS (windows)
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if HP PC is get the correct driver from my PC, (GPU/VGA)
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if this pc is over 10 years old (last year made not first)
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if running XP or Vista, then Plug in play is not going to work on the dead. (MS shut this down)
so i run my scan program (pci dev maker scanner)
omg i see the video chip now, and its a XXXX
(geforce 123)
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then in the nvidia driver i set the default resolution to
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NO OTHERS ARE ALLOWED BUT THE BELOW OR IS OUT OF RANGE!
learn to that using a new PC using and old model
the New PC with NEW OS does not recognize this old model
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you must force your unstated video chop to the below resolutions
ranges. pick one and set it. there.
if running XP or Vista ,both are dead do PNP plug and play is dead, now. in most cases F8 safe boot , set it to say
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but not if the driver for you VGA chip is missing or wrong.
means get it and load it now. in safe mode F8
is this pc connected to the internet as it must?


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