yes, the id.dat contains information about your system and account id. it will be recreated whenever you delete it, then restart. it even contains firmware version, which seems to be meaningless. it will show the firmware spoofed.
I've been trying to figure out qcma and the account id. the id that's created on your computer with qcma is actual the reverse of your account id. I learned this recently. anyway, it's backwards by byte.