I have a similar machine with just one hard disk, but both CDRW and DVD. The DVD recorder is out on USB 2.0 in it's own case. The power is from a 550Watt PSU and the side cover has a huge hole in it for better airflow.
My bet is either heat or power.
You can't do much about the power issue for testing, but try pulling the case cover and pointing a fan at it to see if that helps.
My computer freezes ... when encoding videos, scan for viruses or copying large files or sometime (Rarely) when doing nothing
I have pc on win xp home with:
- CPU Type Intel Pentium 4A, 2000 MHz (5 x 400)
- Motherboard Chipset SiS 645DX
System Memory 512 MB (PC133 SDRAM)
Video Adapter NVIDIA GeForce4 MX 4000 (64 MB)
C: (NTFS) 39205 MB (20240 MB free)
E: (FAT32) 29118 MB (12836 MB free)
F: (FAT32) 78878 MB (8891 MB free)
G: (FAT32) 9212 MB (6729 MB free)
I tired to :
-update the bios
-defrag all hd
-format hd and reinstall windows ( I had a problem with setup windows - the computer hang so I tired a lot of thing and a friend told me to unplug the IDEs (DVD rw and the 2nd hard drive) and it works)
-unplug the second hard disk
-update drivers for video cards and others
but the problem is still there