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Windows 7 X64 not seeing my USB HDD

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a b $ Windows 7
a c 252 G Storage
August 1, 2013 11:28:51 AM

I have a Hitachi 1 TB USB 3 Portable HDD that I am having problems with. I bought the drive on 1/16/2013 so it is approx. 7 mos. old. I just built a new system and I am using the drive to transfer files from my old Win XP box to the new machine.

Initially, the drive worked fine transferring the files. However, now Windows Explorer doesn't recognize the drive. With the drive plugged in, I can use the "Safely Remove USB Device" tool and see the drive. I can click on Remove Drive and Windows makes the sound acknowledging that a USB device has been removed. Conversely, I can plug the drive into a USB port and Windows makes the sound acknowledging that an USB device has been added to the computer, and the light on the drive comes on as it is plugged in - but it does not show up in Windows Explorer! The drive also shows up in the computer's BIOS when connected.

I still have a lot of files on this drive that I need to transfer to the new computer. How can I get Windows Explorer to "see" the drive?

More about : windows x64 usb hdd

a b G Storage
August 1, 2013 11:39:35 AM

You may have to initialize the drive on the Windows 7 machine. Ensure you data is backed up before you do this. After you are backed up, run diskmgmt.msc and see if the drive is listed there. If it is listed, it will also give the disk's status. Reinitializing results in the disk being wiped, but may be necessary. After you reinitialize, right click on the disk again and create a new simple volume. Be sure to use master boot record (MBR) when you set the disk up. GUID partition table (GPT) will only work in 64bit XP and only for data.
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a b $ Windows 7
a c 252 G Storage
August 1, 2013 12:02:21 PM

gbryan101 said:
You may have to initialize the drive on the Windows 7 machine. Ensure you data is backed up before you do this. After you are backed up, run diskmgmt.msc and see if the drive is listed there. If it is listed, it will also give the disk's status. Reinitializing results in the disk being wiped, but may be necessary. After you reinitialize, right click on the disk again and create a new simple volume. Be sure to use master boot record (MBR) when you set the disk up. GUID partition table (GPT) will only work in 64bit XP and only for data.


Thanks for your response gbryan!

The disk IS showing up in Disk Management. It shows as "931.5 GB, Healthy (Active Primary Partition).

Since I cannot access the drive, I have no way to back it up. How do I "initialize" the drive?

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a b G Storage
August 1, 2013 12:35:53 PM

It sounds like the drive is already initialized. It probably just needs to be mapped. Right click and you should have an option to assign a letter or path. Select this and follow through the wizard.

If the files are still on your Windows XP machine, I guess that counts as a backup. To get the files off the disk without mapping it, initializing it, or formatting it, I would use a Linux rescue environment such as Parted Magic (http://partedmagic.com/doku.php?id=start) and transfer them to another drive or possibly the main drive on the Windows 7 machine.
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Best solution

a b $ Windows 7
a c 252 G Storage
August 1, 2013 12:38:30 PM

I finally figured it out. All that I had to do was assign a drive letter to the drive and it was instantly recognized by Windows. Copying my files right now.

Thanks again, gbryan!

Yogi
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