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Some time ago I made virtual drives from a flash drive using this tutorial. The images (all 3 of them of a same drive) worked "fine", that is to say they did mount, and I was busy solving the problems in this question.

Then suddenly VirtualBox stopped detecting them! Basically I have a triangle with exclamation mark in it next to the virtual drive and the error I get on mouseover is VERR_FILE_NOT_FOUND.

The interesting thing is that all images are copies of one and that one mounted fine. One of the copies mounted fine too and I didn't touch the third at all. Furthermore I didn't change any VirtualBox settings and I didn't edit the files themselves in any way.

So how do I find out what's going on?

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Is the file not found literal? Are the disk images in the location that vbox is expecting? –  Paul Nov 17 '11 at 23:02
    
@Paul Yes, they are. I quoted the error directly. When I open the dialog box to select the images, I can see them and select them and when I do, I get ` Резултат Код: E_FAIL (0x80004005) Компонент: Medium Интерфејс: IMedium {53f9cc0c-e0fd-40a5-a404-a7a5272082cd} Позвано: IVirtualBox {c28be65f-1a8f-43b4-81f1-eb60cb516e66} ` and I can't select it. The files seem to be OK. Also moving the images to another directory does not help and changing names does not help. When I try to start the VM, I get No error info error. –  AndrejaKo Nov 17 '11 at 23:27
    
What operating system is this? Could it be a permissions issue? –  Paul Nov 17 '11 at 23:29
    
@Paul Host is windows 7 64bit, but I doubt that it's permissions issue. I didn't change the permissions. I simply shut down the computer and after I started it again, the problem appeared. The permissions are same as they were. Also running as administrator doesn't help. By the way, I have few more VMs that run fine in the same directory as the ones which don't. –  AndrejaKo Nov 17 '11 at 23:30
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