my hard drive not adding up

and note that formatted size is never exactly what it says on the tim.

20GB drive formats to ~18GB

it's because the size is counted in binary, in english 1 gigabyte sounds like it should be 1,000,000,000 bytes (american billion). whilst in actual fact it is actually 1073741824 bytes because it is counte in base two...
 
thx everyone for your help but i found the problem now! it was the system restore , it was taking up over 10 gb of space. i disabled it but im not sure whether i shuld reneable it
 
i dunno about everyone elses but mine did! i didnt think it would do anything so i was really surprised when i saw it freed up 10 gigs of space
 
yeah its useful but often it doesnt restore everything properly and it takes up loads of space
 
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