Windows 7: Extra used space after cloning a drive with Acronis

I have just cloned my d: drive, 500 gb to a new 1 terabyte drive f:

drive f: has 49 gig more used space then cloned drive d:

users on drive f: is 39 gig larger than users on drive d:

the d: drive also has around 50 gigs less used space.


all the other folders are the same size, so not only have I cloned, somehow an extra 49 gb to the f: drive but 10 gb seems to have ‘gone’!

I used Acronis True Image WD Edition and everything appeared to go well.

I don’t want to format my other drive as extra storage until I have some idea what has happened.

Any ideas?

See if this helps
Disk Cleanup - Open and Use
You can also use something like
WinDirStat - Windows Directory Statistics
or
New: TreeSize Free Portable 2.7 (directory usage analyzer) Released | PortableApps.com - Portable software for USB, portable and cloud drives
to identify differences

Thanks, mjf. I'll look at that tomorrow.