It is interesting to see that you use the same laptop for 6 years

and at least you were able to overcome the problem, even partially.
My problem is a bit different.
I have a Sharp AX40 which is also a Mitac M722 in its essence and I tried to upgrade the CD ROM to a DVD drive.
Well, it is not as simple as to take one drive out of the case put the new one in and use it.When I change drives, the DVD drive is not recognised, not from the BIOS, not from the Windows. After some search, I found out that slim line drives also have Master/Slave, function but I dont know how to proceed.
Any help is welcome.