re adding int hard disk drive to iicx yes it is possible to add a second hard drive to a mac iicx internally this is definitely not a recommended procedure by apple but i have done the equivalent to my cx after upgrading it to a quadra the power supply is still the stock cx s and it was able to power two quantum lps drives a pli scsi accelerator a micron technologies bit video board daystar quickcache new technologies overdrive and meg of ram simultaneously i added a new mount for the drive by attaching angle brackets to the drive tower the internal scsi cable was changed to a longer flat ribbon cable onto which i added an extra connector about midway the final hd was internally terminated and the drive between the motherboard and final hd had its terminator resistor packs removed cooling has not been a problem and no scsi problems occur with either the pli scsi chain or motherboard scsi hooked into the two internal hard drives it works very well for me but proceed cautiously if you wish to do the same
