When the obvious has been ruled out....

...you're probably missing something equally obvious.

I was trying to uncompress a large (5Gb) file today, and kept getting "Insufficient Disk Space" or variants thereof.

I tried again (a 10 minute operation) after each of the following:

1. Ensure target disk has plenty of space (80+Gb)
2. Ensure source drive has enough space (10Gb)
3. Ensure temp directory has enough space (just)
4. Ensure system drive has enough space (30Gb)
5. Move temp directory to another drive with more space

I finally remembered that the partition I was copying to had originally been created for a partition-magic style auto-restore partition. FAT32 is a great choice for that sort of thing (boot time access), but not quite as nice for storing single 5Gb files >:(

A swift C:\convert F: FS:NTFS to convert the partition to NTFS without losing any data, and it's all sweet 15min later.

T