Second OS installed on XP but partition letter not D: but E:

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October 18, 2013 at 08:14:58
Specs: Windows XP, 4096
Hi everyone,

I've installed Windows 7 as the second OS on my old XP Professional (I've decided to have two independent OS) and within the original XP system the second partition where Windows 7 was to be installed had letter D: assigned to it.
To my surprise after having the second OS installed and launched I've noticed that the second OS pretends to be installed on E: drive and the D: letter is not available at all (even for the trird partition where I have all my programs and datas).
What is the reason that the D: letter doesn't exist and is not available for second OS?

Thank you all in advance for your valuable comments!


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October 18, 2013 at 09:08:20
Windows 7 setup often creates a small, hidden partition of 100MB labelled "System Reserved" as this is where the boot manager resides for Windows 7, the idea being that, if you can't see that partition, you can't accidentally delete the boot files (something that often occurred with Windows XP & Vista).

So my guess is that D: is that hidden "system reserved" partition, with E: being the partition where Windows 7 is installed.

If you look at the hard drive map in Disk Management you should have a better understanding of how the drive has been partitioned as it shows all partitions including the hidden ones.

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October 18, 2013 at 09:45:48
The hidden partition, created by Win7 never gets a drive letter, so that drive letter D should be available.

But maybe Win7 created an extended partition and installed itself to a logical partition inside the extended partition.

That might be the trick.

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October 18, 2013 at 11:26:33
Are you sure that the drive letter D: is not assigned to your CD drive?

Go to Windows Disk Management and post all the information you see there for all drives and partitions. If you have only one hard drive it will be labeled Disk 0.

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