You will need 50/80-pin actively terminated adapters with an included 4-pin power supply input to connect SCA drives into your SCSI-1 and SCSI-2 buses. One example of a source is mcpricebreakers on eBay. High byte (unused) termination is essential to use these LVD drives in your systems, and even then only SCSI Manager 4.3 will make much of a fist of it. You will have to use the drives as single-ended, and their rotational speeds even then will be (probably) more than the native buses in your Macs can profit from completely. However, you may very well get much-increased storage capacity if your OSes are HFS+ savvy. The 7200 should have room behind for the adapter, but count on needing about an extra inch for each drive. 10k or 15k rpm drives may also bring heat dissipation problems.

Don't let price cozen you into buying inadequate/substandard adapters. Your hair has more long-term value to you than a small present economy. Adapters come in 80/50 and 80/68-50-pin forms.

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