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I have an Acer Aspire 4740 with Windows 7 Home Premium installed in it. This laptop has a local disk C of 90 GB (where Windows 7 is installed) and disk D 270 GB in it. Last week I suddenly could not boot into Windows. I tried to recover it using cmd, but I failed.

There are important documents on it, and I need to access them. So I'm using a Ubuntu 12.04 LTS (Precise Pangolin) live USB (which I'm using "try only" version) to access the local disk C. However I can only mount disk D but cannot mount local disk C. When I double click on disk C, it says:

Cannot mount, because it is in pending operation

What can I do?

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Have you tried to mount it read only? (see eg here:…); if you need to find partition ids… – wmz Apr 12 '14 at 8:38

The issue that you are facing, is that the drive is still marked as active from windows, so the "in use" marker is set to yes, more or less.

I found a post about this from another forum, with the following workaround:

The only current solution I have at this time is Symantec Partition Magic

and that involves a work around. For this to work, I have to create a temporary Primary partition, then (2) mark said temporary Primary partition Active and then (3) delete said Primary partition - this will leave all prior drives uneffected and no drives Active on the hard drive

One side effect of this work around - Partition Magic will alter a Windows Multiboot "boot.ini" file after any partition is deleted

I know that this does not include the ubuntu live disk, but none-the-less, if it works, it works, right? Let me know if this helps you.

Referenced Post: Tom's Hardware

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