Windows 7 only detects 3 of 4 hard drives

Ultimate Windows 7 ultimate 64-bit
June 21, 2010 at 22:25:30
Specs: Windows 64
My Windows 7 has detected 3 of my 4 hard drives hook up. I have drives C E and F, but it wont detect G. The HDD it wont detect does still have windows XP installed on it, but i'm still baffled as to why I can't browse it as just another hard drive.

My device manager shows that it's there and working properly in my disk drives, yet windows won't display it in My Computer.

Is there a way to force Windows 7 to re-detect that hard drive so it will show up in My Computer?

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June 22, 2010 at 00:20:23

can u pls check whether G drive is fat32 filesystem or NTFS and go to computer management there u can find disk management right click on it and click rescandisk i think it will show u how many partitions u have.

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June 22, 2010 at 04:52:58
computer, right click, choose manage, disk manager, you should be able to see your drive there, if so make sure it has a letter, make sure it is not hidden.
if you see it but cannot get it to show up, and if you do not need xp, which obviously you dont if you have win7, delete the drive format to ntfs and it will show as a usuable drive.

i hate computers!
but cant help myself....

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June 22, 2010 at 04:57:53
Do you actually have 4 hard drives installed?

Are they all internal?

Are all of them properly identified in the POST screens by the BIOS?

As was stated above, look for the drive in Disk Management.

Could be that 2 of your drives are joined as a dynamic disk. If that is the case it will show in Disk Management.

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June 22, 2010 at 15:55:45
Yeah the drive shows up, but there is no letter and my only option when right clicking on it is to delete the volume. I'm sure a reformat will fix this, so thats what i'll have to do. Now all I need to do is buy another hard drive since I still have valuable info on there that I need to transfer before reformatting it.

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June 22, 2010 at 16:41:05
When in Disk Management list ALL the information there is for EACH drive.

I don't think you understand what a dynamic drive is. If that is what you have it most likely involves 2 of your drives that are working as one. You can't separate either of them if that is the case. Trying to do so may trash the data on both of them.

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June 22, 2010 at 18:50:06
I disconnected my drive with XP on it when I installed win7 so as to not accidentally delete all my important info.

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June 22, 2010 at 22:15:34
you can save all the files from the xp drive and any valuable info to one of the other drives/partitions.

try removing the xp drive, bootup shutdown and reinstall the drive

you may want to download easybcd, its free and may find your xp os and add it too the boot,

your xp drive may also be jumper set as the main drive, not sure that makes any difference but try setting the jumper to slave.

or get a hold of a external case for your xp drive, they are very cheap, then connect as a usb drive, you should be able to see and use the drive fine from there..

i hate computers!
but cant help myself....

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June 23, 2010 at 05:07:51
To save your data on it, get/create a Live Linux CD/DVD and boot to it. The Live Linux will not install, just run from RAM, but it will allow you to resave/copy the files from the old drive onto one of your other drives. Then you are OK with deleting the original partition and creating and formatting a new partition in the now available space. If you have enough available space on your other drives, you may be able to avoid purchasing a new drive.

You have to be a little bit crazy to keep you from going insane.
If all else fails, read instructions.

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June 23, 2010 at 14:49:59
I was planning on getting a new TB drive anyways or possibly an SSD. But thanks for all the info guys.

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June 23, 2010 at 23:11:36
If the drives are powered by the USB bus and do not have their own external power supplies the problem is that the laptop is not supplying sufficient USB power to drive both.

The USB specification is that each port should supply 500mA at 5V. To conserve their batteries, laptops usually provide 500mA to be shared between all the available ports. If you need to use several USB devices with significant power requirements you need either an external powered USB hub or to provide the devices with their own power supplies.

See this:

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November 3, 2010 at 03:36:48
I'm actually having the same problem with more than 3 external hard drives, and all the drives are NTFS. I tell you, I had a moment of panic, as I one of the drives as full back up of my computer on one of the undetected ones, and the computer needs to have a chip set swapped out, or the entire machine exchanged.

Running Windows 7 64bit Pro. Futzing around in disc management doesn't do a thing. I've tried everything listed here, but no joy, machine will only detect 3 external drives. I've tried using a powered hub, but no joy, will only detect 3, max. If I remove one of the drives it does read, and re-plug one of the undetected ones in, spins right up without a problem. It's gotten to the point I want to just consolidate all the data onto 2 or three drives only.

On a funny aside, other USB items (graphics tablet, usb headphones added AFTER the drives weren't detected) have no problem being detected and functional.

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