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Wd raptor a full 250gb?

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August 2, 2012 11:44:13 PM

Hello, I'm wondering if the WD velociraptor 250gb is actualy a full 250gb because they've been known for not having the right amount.

Thank you

More about : raptor full 250gb

a b G Storage
August 3, 2012 12:09:59 AM

the hard drive manufacturers define 1TB as 1 000 000 000 000 bytes. however, the operating system recognizes 1TB as 1 099 511 627 776 bytes (2^40)

so your 1TB drive will be ~909GB and the 2TB ~1.82 TB
a 250gb HDD will have around 232gb usable space.


this is because of a few reasons, one is they often use 1000 instead of 1024 in their calcualtions of their drive capicaty and another is as soon as you format the drive it will use space to setup the file system you have choosen.

This is not a new devlopment, its been around for many years and every manafacturer is the same

see link below for further details http://scripthacks.wordpress.com/2009/10/21/calculate-usable-hard-drive-size/
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a c 539 G Storage
August 3, 2012 12:11:37 AM

HDD & SSD manufacturers calculate 1 Gigabyte as 1,000,000,000 bytes.
Microsoft Windows (and memory RAM manufacturers) calculate 1 Gigabyte as 1,073,741,824 bytes.

The difference between the 2 methods is 7%. So whenever you buy a drive (HDD or SSD) subtract 7% and that will be your usable capacity.
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a b G Storage
August 3, 2012 1:58:48 AM

Technically the drives themselves are the exact rating (plus usually a little extra on some drives) but with Windows since they use different byte calculations it would certainly seem like you lose some memory size, but in reality it's the same. If you have a 1GB file according to windows it's 1GB.. but really it's more then 1GB. I think Linux uses the same byte calculation as HDD manufacturers. It's kinda like Celsius and Fahrenheit, both have different measurements but the actual temperature remains the same.
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January 27, 2013 3:19:15 PM

gougeface said:
Hello, I'm wondering if the WD velociraptor 250gb is actualy a full 250gb because they've been known for not having the right amount.

Thank you


It would be great if the previous posters were giving you info that could actually help you. I know what you are talking about. We have found that attempting to use WD 250's in a RAID environment that we are unable to because they appear .1GB smaller than their Maxtor & Seagate counterparts. In other words, you can use a Seagate or Maxtor drive to replace a WD 250, but not the other way around. In our case we just stopped using the WD model.
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