The amount of space a file occupies on your hard drive is different from — and almost always larger than — the actual/reported size of the file.
You have to allow for the difference when sizing a new hard drive.
Where are all those missing gigabytes?
Reader Bob Todd wants to add a new hard drive to his system, but he encountered a problem when trying to calculate the size of the drive he’d need.
- “I am considering putting a new solid-state drive (SSD) in my PC and making it my C: drive — containing all Windows and program files. Most of my data is on my D:drive. I think the SSD will boot my PC and run apps much faster.”I was looking at a 240GB SSD and thought I’d better check how much of my current 450GB C: drive was in use. I did this two different ways and got two very different answers.
“Windows Explorer reported 209GB of files on the C: drive — probably OK for the move but a bit closer to the SSD’s capacity than I’d like. Then I used WinDirStat [free; site] to have a look, and it showed only 139GB used!
“Why the difference?
“I am guessing that the used-space figure in Explorer is wrong, but I worry that during the conversion I’ll end up with a drive full notice about 90 percent of the way through the process.