Windows 7 Disk is not accessible. Access is denied.

Resolution

In order to resolve this issue, go to the Windows Explorer and follow the below mentioned steps.

Right-click on the inaccessible hard drive.
Click Properties.
Go to the Security tab, and then click Advanced.
Click ‘Edit’ by going to the Owner tab.
Modify the ownership of the desired account.
Alternatively, you can also try the following option, if you are not able to access any file or folder on a Windows 7 drive.

Right-click on the inaccessible file or folder.
Click Properties.
Select the Security tab.
Click your name Under Group or user name. This would show you the permissions you have to access the file and folder.
You can also try the following method

Change the drive letter for inaccessible hard drive.
Run the following command: chkdsk /r I:
Try to boot into the safe mode and access the HDD.
Try accessing the HDD in Windows 7 Ultimate and Home Premium.
You will be able to access the drive, as chkdsk command would have deleted the files that were causing the problem.