Deleting the 2x 4x 16x etc. from root of hard drive?

[Ranmax09]

Is it ok to delete the folders 2x, 4x, 16x, 32x etc.. from the root of my harddrive? I'm trying to make a map for California but my harddrive keeps running out of space because of those folders! They already have those folders in the gmdl/bin/debug/_California. Please help. When I right click on the 2x folder and go to Properties it says
Size - 352mb
Size on disk - 15.9GB!?
What's up with that?

Thanks

[deniska]

you probably storing the map on the old FAT filesystem... use FAT32 or NTFS to save space..

[Ranmax09]

Oh, I'm using my External Harddrive and it's using FAT32. Should I use my regular hard drive (Local Drive (C: )? It only has 5GB Freespace left. Will that be enough for downloading California? My Local Drive (C: ) is NTFS BTW.