How do I use an entire HDD larger than 128GB?

February 26, 2011 at 21:51:26
Specs: Windows 7 Home Premium 32 Bit, Pentium Dual Core
I have an old Iomega IPHD20 external hard drive and I want to replace the 20 GB drive that's in that with a newer WD 2500BEVE 250 GB one. It seems to work except that in Windows it only shows up as about 128 GB. Does anyone know how can get it to use all 250 GB?

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#1
February 26, 2011 at 22:20:54
I suspect the external enclosure is not 48bit LBA compliant so unless there is a firmware update available for it ( I doubt there is any or even a way to install such) there is no way to use a large drive in that enclosure. Visit 48bitlba.com for a full explanation

Goin' Fishin' (Some day)


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#2
February 27, 2011 at 00:21:43
Is the 250 gig a used drive? If so, maybe its previous usage was in a non 48 bit LBA compatible machine. Did you repartition it when you hooked it up to the windows 7 computer?

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#3
February 27, 2011 at 10:28:56
I deleted all the partitions, using a Windows XP setup disc, and then attached the drive via the external hard drive case to my windows 7 computer. Then I used windows 7 create a simple volume but the whole hard drive only shows up as 128 GB.

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#4
February 27, 2011 at 17:36:25
Seems like it ought to be seeing the entire drive. I believe it takes at least XP sp1 to see a drive larger than 128 gig but that shouldn't matter if you're just deleting its partitions.

I thought there may be a limiting jumper for older bios' but I couldn't find the jumpers for that specific drive. All I could find was this general info on those drives:

http://wdc.custhelp.com/app/answers...

Check your windows 7 disk management and see if the rest of the drive space shows as unallocated space.

Or maybe it is the enclosure as Richard says. I didn't think the enclosure affected the way the drive was seen by the OS, but maybe so.

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#5
February 27, 2011 at 18:47:45
"I deleted all the partitions, using a Windows XP setup disc,..."

The XP CD must have SP1 or later updates integrated into it in order for it to be able to recognize hard drives / hard drive partitions larger than 137gb manufacturer's size = 128gb binary size in the bios and in the operating system.

The enclosure's circuits must recognize the full size of the hard drive.

You can usually see the size the external hard drive circuits detect in the mboard's bios.

If the enclosure's circuits recognize the full size of the drive, if the XP CD had no SP updates at all, it can't make a partition larger than 128gb.

In that case you can go to Disk Management in Windows, delete the existing partition, and make a new one, or more than one, that fill the available space on the hard drive.


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#6
February 28, 2011 at 07:03:09
The setup disc was for Windows XP SP3.
It only shows up as 128 GB, there is no extra unallocated space.
It could see the dirve in BIOS, but I couldn't find anywhere to tell its size.
I've tried making a new partition in Windows 7 a couple times.

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#7
February 28, 2011 at 10:03:28
Your Iomega IPHD20 was made in 2002 or so and the enclosure's circuits may NOT be able to recognize the full size of hard drives larger than 137gb = 128gb binary.

Your WD2500BEVE drive should have NO jumpers installed on its pins
WD Scorpio Blue (EIDE)
http://support.wdc.com/product/kb.a...


Look in your mboard's bios Setup to see if that shows what size of hard drive the external drive enclosure is detecting.
If you see that and it says ~128gb, you need to buy yourself a hard drive enclosure - for an EIDE ( PATA) 2.5" hard drive. I recommend Vantec.


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#8
February 28, 2011 at 14:18:40
I looked in the BIOS and it saw the harcd drive but did not show how big it was.

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#9
March 1, 2011 at 07:01:50
New hard drive enclosures are relatively cheap and they all support recognizing any size of drive.

The Vantec ones have a USB Y cable with two USB plugs on the computer end for laptops that can't actually supply 500ma from one port built into the laptop. One of the USB plugs is pass through so other USB devices can be plugged into it. The hard drive mounts using 4 screws through the internal board rather than just plugging into the data / power connector like the situation in cheaper external enclosures. The Vantec external enclosures also have a jack you can plug a 5v DC external adapter into, although it doesn't come with that, so you have the alternative of plugging in one USB connection at the computer and using a 5v external adapter when one USB port can't supply 500ma.


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