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Hard drive missing 20GB

post #1 of 13
Thread Starter 
I installed Windows again on my desktop but I noticed rather than being ~320 GB (WD3200AAKS), it's down to 298. I checked for hidden partitions from a left over install but no luck.

Any ideas?

Pic of Disk Management
snowRAZR
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post #2 of 13
Drives are never the same size as you bought them, if you didn't know,
My 1tb is only letting me use 931Gb. They do this for a reason, which i don't have the answer to.
post #3 of 13
Quote:
Originally Posted by Socks keep you warm View Post
Drives are never the same size as you bought them, if you didn't know,
My 1tb is only letting me use 931Gb. They do this for a reason, which i don't have the answer to.
Yup, 1TB on here is giving me about the same. 150gb=148GB and 500gb= 465 on other rigs.
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post #4 of 13
Hard drive manufacturers refer to space in decimal form, and Windows reports it in binary form.

http://www.pcguide.com/intro/fun/bindec.htm
Quote:
Storage devices however are where the real confusion comes in. Some companies and software packages use binary megabytes and gigabytes, and some use decimal megabytes and gigabytes. What's worse is that the percentage discrepancy between the decimal and binary measures increases as the numbers get larger: there is only a 2.4% difference between a decimal and a binary kilobyte, which isn't that big of a deal. However, this increases to around a 5% difference for megabytes, and around 7.5% for gigabytes, which is actually fairly significant. This is why with today's larger hard disks, more people are starting to notice the difference between the two measures. Hard disk capacities are always stated in decimal gigabytes, while most software uses binary. So, someone will buy a "30 GB hard disk", partition and format it, and then be told by Windows that the disk is "27.94 gigabytes" and wonder "where the other 2 gigabytes went". Well, the disk is 27.94 gigabytes--27.94 binary gigabytes. The 2 gigabytes didn't go anywhere.
post #5 of 13
The advertised size is the unformatted size of the hard drive. When you format a hard drive it uses a different size per gigabyte. Say for instance an 80GB drive default formatted at 1000 is 80000/1000 = 80 windows uses about 1075 per gigabyte so 80000/1075 is 74.4 which is why it is lower.
post #6 of 13
Quote:
Originally Posted by XAslanX View Post
The advertised size is the unformatted size of the hard drive. When you format a hard drive it uses a different size per gigabyte. Say for instance an 80GB drive default formatted at 1000 is 80000/1000 = 80 windows uses about 1075 per gigabyte so 80000/1075 is 74.4 which is why it is lower.
That isn't really it. While formatting takes space, see my post above. That's where the bulk of it "goes".

Edit: Okay, reading it again, it's half right. It's not the formatting that does it though. It's a discrepancy of measurement.
Edited by Princess Garnet - 4/22/11 at 1:45am
post #7 of 13
Quote:
Originally Posted by Princess Garnet View Post
That isn't really it. While formatting takes space, see my post above. That's where the bulk of it "goes".

Edit: Okay, reading it again, it's half right. It's not the formatting that does it though. It's a discrepancy of measurement.
Close enough for me, formula I came up with for formatting partitions to know how much actual space I have usable.
post #8 of 13
Drive size being reported as different than what's printed on the box has a few causes.
1) Manufacturers usually use 1000 instead of 1024 for Kilobytes, Megabytes, and Gigabytes so that skews it somewhat. Apparently, the marketing department can't wrap their heads around that extra "24" in each 1000.

2) This is for HDD's only, as I'm not sure about this with SSD's. With HDD's, the metal "platter" or "disc" inside has a magnetic charge. Just like a battery, this charge WILL slowly dissipate over time. When you format, any sectors with a low magnetic charge will be marked as "Bad" and marked as so in the table for available space. Sometimes, heavy drive activity can change this magnetic charge and make some bad sectors come back, but this is more the exception than the rule.

When I say the magnetic charge WILL dissipate over time, with regular usage, it normally "charges" or "freshens" the magnetic charge. If it sits on the store shelf for 6 months before you buy it, it's gonna have slightly lower capacity than a drive that only sat on the shelves for 1 week because of this. Just like if you work out every day, you can lift some heavy weights, but if you sit on your butt playing WoW every day for 6 months, lifting something heavier than a 1 liter bottle of Mountain Dew becomes quite the chore.

EDIT Holy crap I need to type faster! lol
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post #9 of 13
Generalization has ment 1GB=1000Mb. When it is actually 1GB=1024mb...
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post #10 of 13
hard drive manufacturers says 1 GB is 1000*1000*1000 bytes. This is wrong, and the OS has it right: 1 GB is 1024*1024*1024 bytes.
this accounts for your 'lost' storage
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