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2.5Tb drive cannot format whole drive

post #1 of 9
Thread Starter 
Having a few problems with a WD 2.5Tb Caviar Green drive, model no WD25EZRS.

The drive came with a PCI-e 1x card, but no real explanation of why it was needed. I can plug the drive into either the PCI-e card or my onboard SATA ports and both do exactly the same thing.

The drive shows as full capacity but with a 280.77Gb unformattable partition on the end, meaning I can get a maximum of 2Tb formatted, have tried reading articles on large sized drives online but have just ended up confused .

Most places seem to hint it is fine to use a large capacity drive as a secondary hard drive and should show up ok. I am running Win 7 and have 2 SSD's in RAID 0 as my boot drive.

Don't really have a clue what to look at next but a bit gutted the drive doesn't seem to show up properly.
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post #2 of 9
O_o i always thought you needed UEFI to display and use more than 2.2 TB drives :/ kinda sucks.
    
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post #3 of 9
I believe you need to initialize it as a GPT disk if I'm not mistaken.
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post #4 of 9
Quote:
Originally Posted by LemonSlice View Post
I believe you need to initialize it as a GPT disk if I'm not mistaken.
This, it allows for over 2 tb partitions

Here's a nice read on it too. http://msdn.microsoft.com/en-us/wind...dware/gg463525
post #5 of 9
Quote:
Originally Posted by scotty453 View Post
O_o i always thought you needed UEFI to display and use more than 2.2 TB drives :/ kinda sucks.
No, when it tells you to initialize it, DONT CHOOSE MBR, choose GPD (or whatever it is). That will let you se more than 2tb per partition.
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post #6 of 9
Thread Starter 
@Scotty - Yeh I read that somewhere but as far as I read you need UEFI to use as a boot drive.

@LemonSlice - You were spot on, what is the difference between a normal disk and GPT?


Cheers for your help guys.
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post #7 of 9
GPT supports partitions over 2TB, MBR doesn't.
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post #8 of 9
Thread Starter 
Fair enough thanks again.
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post #9 of 9
Quote:
Originally Posted by LemonSlice View Post
GPT supports partitions over 2TB, MBR doesn't.
It's actually 2.2TB. (metric)

It's an integer limit. Sectors report as 512 bytes, and the max value of a 32bit int is 4294967296. (-1) The MBR partition table has to list the number of sectors each partition takes up. (or maybe it's the starting sector? I don't know. Either way, 2.2TB (metric) is the limit.)

512*4294967296 = 2199023255552

Divide by 1024 a few times and you have... 2147483648 KiB, 2097152 MiB, 2048 GiB, 2 TiB


Note: A 2TB (metric) drive reports 1.81 TiB in Windows. (but displays TB - the wrong prefix)
     
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