I have a Dell Inspiron 600M, from around 2004. The partition table looks like this:
Device Boot Start End Blocks Id System /dev/sda1 1 6 48163+ de Dell Utility /dev/sda2 * 7 3478 27888840 7 HPFS/NTFS /dev/sda3 3479 6838 26984449 5 Extended /dev/sda4 6839 7295 3670852+ db CP/M / CTOS / ... /dev/sda5 3479 6694 25824256 83 Linux /dev/sda6 6694 6838 1159168 82 Linux swap / Solaris
Does anyone know what sda1 and sda4 are for? I did not create them, so I imagine Dell installed them when the machine was built.