A few days ago my computer restarted and did a physical memory dump. This has happened only once. I didn't think much of it until I defragged my hard drive and discovered some rather big files that couldn't be defragmented. On the C drive (Windows 2000) C:\WINNT\MEMORY.DMP is 383 MB. There are also 5 small files that won't defragment and the drive is 10% fragmented with 21% file fragmentation. On the D drive (also Windows 2000) is D:\pagefile.sys and it's 384 MB. The drive has 11% fragmentation and 22% file fragmentation. My other partition has files and programs and it's fine. What exactly is a physical memory dump and why does it happen? I just did a clean install of Windows, I don't know if that means anything. What can I do with these big files that seem to be left over? Thanks for the help.