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Hardrives not full specified capacities?

post #1 of 19
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I've never really thought about it much before but, how come some HDDs don't have the advertised amount of hard drive space? For example, One of my Hardrives is 500GB advertised, but theres 465GB for usable space. What happened to the other 35GB? I dont have an OS installed on this hardrive either.


Drive F is a 500GB Dardrive, notice how its capacity is 465GB however.
    
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post #2 of 19
Hard drive manufactures measure using 1000 MB per GB, but the actual conversion is 1024 MB per GB, since it's based on base 2. (2^10) The size reported by your computer is based on the correct 1024 MB Per GB number.
Edited by charlie97 - 4/24/11 at 12:42pm
post #3 of 19
Quote:
Originally Posted by toxaris71 View Post
I've never really thought about it much before but, how come some HDDs don't have the advertised amount of hard drive space? For example, One of my Hardrives is 500GB advertised, but theres 465GB for usable space. What happened to the other 35GB? I dont have an OS installed on this hardrive either.


Drive F is a 500GB Dardrive, notice how its capacity is 465GB however.
The manufacturers use the Decimal counting system when stating a HDDs capacity where as the computer uses Binary.

Binary 1 kB is 1024 bytes.
Decimal 1 kB is 1000 bytes.

There is also an overhead after formatting a HDD.

Edit**Condensed the info a bit.
Edited by jackbrennan2008 - 4/24/11 at 12:47pm
post #4 of 19
Hard drive manufactures measure using 1000 MB per GB, but the actual conversion is 1024 MB per GB, since it's based on base 2. (2^10) The size reported by your computer is based on the correct 1024 MB/GB number.
post #5 of 19
Edit.
Edited by pjBSOD - 4/24/11 at 12:43pm
post #6 of 19
Quote:
Originally Posted by E-Peen View Post
There is always reserved space. You will never get the true amount of space you're paying for.
Wrong this is why: Hard drive manufactures measure using 1000 MB per GB, but the actual conversion is 1024 MB per GB, since it's based on base 2. (2^10) The size reported by your computer is based on the correct 1024 MB/GB number.
post #7 of 19
What jackbrennan2008 said.

For example my 1tb is actually 930gb cause of that reason. >.<

Quote:
Originally Posted by charlie97 View Post
Actually 35GBs are reserved for Required Scripts and The Operating System Required Files Such as the Program Files
Uhh no.
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post #8 of 19
Quote:
Originally Posted by charlie97 View Post
Wrong this is why: Hard drive manufactures measure using 1000 MB per GB, but the actual conversion is 1024 MB per GB, since it's based on base 2. (2^10) The size reported by your computer is based on the correct 1024 MB/GB number.
Very interesting, thanks for the clarification.
post #9 of 19
Hard drive manufacturers use decimal systems to count hard drive capacity. 1 gigabyte is 1000000000 bytes to them. To windows, a gigabyte is actually 1073741824 bytes. So if you multiply the number of bytes in your hard drive, 500*1000000000, then divide that product by the number of bytes windows sees as 1 gigabyte, you get how many gigabytes Windows says you have (465.66GB). The amount of space reserved by the system is a common misconception. It is not nearly 35GB.
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post #10 of 19
Quote:
Originally Posted by charlie97 View Post
Hard drive manufactures measure using 1000 MB per GB, but the actual conversion is 1024 MB per GB, since it's based on base 2. (2^10) The size reported by your computer is based on the correct 1024 MB Per GB number.
//insert buzzer sound from portal 2

No, Gigabytes are in directly convertible like that, 1000MB in a GB.
Gigibytes, however, are 1024MiB per GiB. I forgot what the direct conversion of GiB -> GB is.
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