I have a Samsung laptop mfg’d (sold) by a defunct computer company. As best as I can tell, it’s Samsung model # is NP-P55. The drive being replaced is a Sony DW-G520A, IDE. I purchased and am returning a Sony AD-7581A because it wasn’t set to master and I wasn’t able to figure out how to change it from CS to master. I see a Sony AD-7590A for a good price, but need to be certain it will work in my laptop. I’m not stuck on Sony, just had good luck in the past. Any help or advice will be greatly appreciated.