when the user does not have a disk partition is idle, why not merge the free partition to the 10%-letter character, you can follow the following method to Win7 Merge Disk Partitions .
Operation Steps
1, first right mouse button on the desktop "computer" Select the "Management" option, and then open the Computer Management window, click on the left side of the Window menu bar "storage-Disk Management."
2, now on the left to see all the disk partitions on the computer, because the computer has been partitioned, all if you need to repartition the partition must be a number of useless disks to the first compressed a blank partition, such as D disk and 50G useless, you can compress it into an unpartitioned disk. Right-click the D disk, then select "Compressed Volume", and then in the "Input compressed space" above the input compression size, if it is 10G is 10*1024MB=10240MB. Then click "Compress" to complete the operation.
3, now will be a 10GB of free space in the disk list display, if you need to merge the 10G compressed volume to other disks, such as C-disk. Right-click c to select "Extended Volume" to execute the Extended Volume wizard window, select the disk with 10GB of free space, and then click "Next".
4, this will complete the operation of the expansion volume, now the 10G disk is loaded into the C disk.