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Windows 7: Spare hard disk prevents windows loading

23 Dec 2013   #1

Windows 7 64bit
Spare hard disk prevents windows loading

I have Windows 7 installed on a 1TB disk, and a spare 3TB disk.

I'm trying to change the OS from the 1TB disk to the 3TB disk.

I used a partitioning program to change the 3TB disk's FAT partition to NTFS, (thinking it would improve performance!)

Now, if the 3TB disk is connected, none of the operating systems (that is the Windows 7 on the 1TB disk, nor the Windows 7 installation CD disk) will start. I get the message "loading Operating system", then .....nothing.

I use the F12 key which should allow me to choose which disk to use. I have also used BIOS setup to set the disk I need.

To summarise, I can only start Windows by disconnecting the 3TB disk, I therefore can't access the 3TB disk at all.

Have I made the 3TB disk unuseable?

Any advice would be very much appreciated.

My System SpecsSystem Spec

23 Dec 2013   #3
Microsoft MVP


Unplug the other HDD, boot the Windows 7 installer as UEFI (Unified Extensible Firmware Interface) - Install Windows 7 with - Windows 7 Forums.

Delete all partitions as shown in tutorial during the booted install. This will force the installer to format the disk as GPT to allow install to such a large HDD.

If any problems wipe the HD first with Diskpart Clean Command
making sure to back up any files first.
My System SpecsSystem Spec


 Spare hard disk prevents windows loading

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