DT keeps "unmounting" images

[Crembo]

Hello, my friend is having a problem with DT. No matter what image he mounts, after some % (random) of the install, suddenly an error appears and you can see that DT unmounted the image.

We tried everything, but nothing seem to work.
Everything works perfectly in my PC.

Thanks in advance.

[Underheaven]

I know this seems silly, but try to create an image with a different program and see if the problem still occurs.

[Crembo]

Well I tried few programs at his PC, and it's the same problem.

[Copytrooper]

Image is unmounted if access fails due to some reason, so where is the image located (local hdd, external, network, usb, firewire, RAID, etc.)?

[Crembo]

Just simple local HDD. Interesting though everything worked fine few months ago...

[Blazkowicz]

Possibly some non-standard hdd drivers are installed.

[Underheaven]

One testing idea would be to burn an mds/mdf test image onto a CD-R and see if it can be mounted from there without unmounting.