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Windows 7: Upgrading to Windows 7, are non-OS HDDs affected?

20 Feb 2014   #1

Windows 7 Ultimate 64
Upgrading to Windows 7, are non-OS HDDs affected?

I'm still on XP and since support is being cut very soon I'm getting ready to switch to Windows 7. Just a small silly question, my setup right now is one HDD for the OS and two big HDDs for storage, do I need to do anything to the non-OS HDDs or will they be good to go once Windows 7 is installed?

My System SpecsSystem Spec
20 Feb 2014   #2

Windows 10 Pro x64 x3, Ubuntu

Assuming you have NTFS file system on the data Drives, you may have some initial issues actually accessing the data, this is a function of NTFS file security, Basically your new UserID on windows 7 will not match your current XP one

This is an issue that is seen often, but can be a little off putting

I posted a solution at our sister site Eightforums, a short while ago - you may want to have a read through before you make the change :)

Solved Going insane with Access Denied - please please help.
My System SpecsSystem Spec
23 Feb 2014   #3

Windows 7 Ultimate 64

Are you sure about this? I asked elsewhere and they said I'd be fine. Unless you're talking about installed programs or something? The two HDDs in question don't have anything installed on them, it's just video files and stuff that are stored.
My System SpecsSystem Spec

23 Feb 2014   #4
Mellon Head

Win 7 Pro x64/Win 10 Pro x64 dual boot

I think if it's just data, you should be OK (Though Barman's advice is sound if you do have a problem). I would unplug the data drives and just leave the OS drive connected while you install Windows 7, though. It's not completely necessary, but it's a good practice in case something goes wrong in the installation and corrupts the drives.
My System SpecsSystem Spec
24 Feb 2014   #5

Windows 7 Ultimate x64

There will be no major problems, the Windows install don't touches anything outside the drive you choose to install in it (make sure you select the right one when asked). Other partitions and drives, as well as files on the very same partition being installed are left alone if you don't explicitly reformat them.

Barman58 got it right when pointing out the possible permission problem. You might get some "access denied" errors, but the files are still there, just take ownership/give full control once on the new system.
My System SpecsSystem Spec
24 Feb 2014   #6
Microsoft MVP


Unplug all other HD's, follow these same steps to do a perfect Clean Reinstall - Factory OEM Windows 7 - Windows 7 Help Forums
My System SpecsSystem Spec
24 Feb 2014   #7

Windows 7 Pro x64 Windows 10 Pro x64

As Greg states, unplug those 2 drives before you start installing Windows 7 (Very Important)
My System SpecsSystem Spec
25 Feb 2014   #8

Windows 7 Pro 32-bit

All are OK, unless you encrypted files/directories on the disk/drive with EFS.
My System SpecsSystem Spec

 Upgrading to Windows 7, are non-OS HDDs affected?

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