Windows 7 - HArd Drive not recognised

i have been trying to format an old external hard drive that was previously used on my Macbook laptop, i have run disk utility in OSX and formatted it as MS DOS - when i plugged the HD into my PC it said intalling drivers and successfully installed them and it said device ready to use - but i cant find the HD anywhere??? i use windows 64bit HP.

Can you post a screen shot of Disk management with old external hard drive?
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Does it appear in the Disk Management?

First thing right click on Computer Icon in explorer and click Computer Management, then go to the Disk Management it should appear. Maybe try to format NTFS and see if windows can see it after a reset.

If not you may have the problem I had, that I forgot to install the raid drivers, I have a gigabtye board, which has two gigabtye raid ports, it is not in a raid array, but they would not detect untill the driver were installed.

Is the drive empty, if so have a look here and see if that helps. Drives - Hide or Show Empty Drives in Computer Folder

I had this problem with an external drive, I still haven't got it to work still looking for solutions.

thanks for the tip, yh i now can at least find the drive, but it shows no storage capacity and is unformatable??



heres a screenshot of me in OSX about to format it, anything seem wrong here? thx in advance all who help me with this problem:

Will the HD show in Disk management?

when i plugged it in i got the following popup from DM prog. - i didnt want to go ahead and clicl anything in case it does something to my existing hard drives (i have 3 in total) since i am unsure which disk the DM prog is referring to here, its not labelled "volume:H", so thought i'd askl here first

is it okay for me to initialise this disk ^^^ / allow disk manager to access it? what settings are optimal here for me? i will be using the drive to transfer from my old vista machine onto my new system. thx in advance for any help give

This problem also happens quite frequently if you use USB HDD's that you swap between different computers.

The simplest solution in general is to go into Control Panel==>administrative tools==>computer management==>disk management.

You'll then see your drive without a drive letter.

Assign it a drive letter and after a little while you should see the disk in Windows explorer.

If you use the USB drive a lot and attach it to different machines this problem can get quite irritating so you can overcome it by "resetting the DiskID" - a unique number generated by Windows.

Once you've done this the USB drive should be seen automatically again.

USB disks are usually assigned internally by Windows a unique ID - so if the ID is "in use" already you won't automatically see the drive.

You can reset these but take care - I won't be responsable if you lose data !!!

How to Change the Disk Signature of a Drive Without Losing Existing Data or Reformatting (howtohaven.com)

Cheers
jimbo