Ski susan shoe

Can I safely delete registry keys showing out-of-date DOS Mounted devices? - key mount e blade

My OS (Win XP Pro) is a clone of my C based on: Drive with Norton Ghost, in fact ... The log shows the devices mounted DOS-C, D, E, F and H (not G) under HKEY \\ \\ \\ \\ \\ \\ \\ \\ LOCAL MACHINE \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ SYSTEM \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ \\ mounted devices, but currently only pratitions C + D + DVD-RW, and E.

Can I safely delete the disabled F + H keys at least? What is E? DVD-RW is valid DOS drive installed? Thank you.