I put already a hol new drive in the mz2000 everthing stays with the same problem , i now the system Drive 1.44mb and 720k that is realy strange i buy a brand new drive en install it in the MZ200 have alreaddy put a second drive(1.44 mb i am verry shoure abaut thess drives i tested the drive in a old computer with windows XP on it and the seeme drive format without problems on 1.44 mbt , it stays the seem problem ,won's read 1.44 disks only the 720 disks is it all ok in the MZ2000 not the 1.44 disks ,