It's probably all the Mac A/V's & F/W's that's filled it right up. The defrag and tweak software explains the remainder.
Only 10+ months with my MBP and not enough of the above? How curious. Did the new version of All-MS-OSes4Mac
have the DOS complete installed too?
Joking!! I love my MacBook Pro, and will lose some Steam games for sure. Many GBs will be recovered tomorrow for sure. Then I'll check the s/w mentioned here.
Thanks everyone for your help.
Cheers all.