OS is Vista. From new the hard drive was partitioned into C and D with D allocated as a backup, but I now want to allocate all the available space to Drive C. (I’m using Acronis and an external drive for backup) How do I allocate the space formerly used by Drive D to Drive C ? Computer Management shows that there is 4.56 GB free space in D, which I assume I could add to drive C. But how??? (“Extend Volume” in drive C is greyed out)
It looks like the D: partition was your recovery partition from which you could restore the computer back to how it was when you first bought it. I hope you made the recovery disks when you got the machine. To get the use of this unallocated area you will now need a partition manager. For a good free one try Easeus Partition Manager. click here With this you should be able to move the C: partion to the start of the disk and then extend it to occupy the full disk.
I've kind of ground to a halt on this. I downloaded Easeus Partition Manager AND Partition Wizard but I'm uncertain how to proceed with either of them (downloaded both because I thought one might be clearer than the other - it isn't!). The unallocated area is 10GB - so not that large - and I may leave it as it is.
Never give up, open up Partition Wizard and highlight your C: drive in the graphical view, right click and select Move/Resize. From there its straightforward, either drag the slider to the left or use the arrow boxes below. Click apply and Partition Wizard will tell you it needs to reboot to complete, click yes.