Strange one this. I have a new bare SSD I'm trying to add to my system. When installed in the enclosure I have set aside for this drive it will not show up on my system. To confirm the enclosure is not at fault I installed a mechanical SATA drive and that mounts correctly. To confirm the drive itself is not at fault I installed it in another enclosure and was able to mount and format it correctly. The pairing of this drive with this enclosure seems to be the issue.

So before I last resort to removing an internal drive and swapping with the new SSD, I want to see if there is a formula for testing or making an enclosure work. I noticed the SSD is rated SATA III. The enclosure is Firewire 800 so that gives you an idea of its vintage. Its a solid enclosure by Fantom Drives so its a decent product. Could it be the enclosure is only rated to SATA II or something weird like that. Is there a way around that limitation (firmware?). Or is this just the way it is?

Enclosure is powered by AC/DC adapter, not bus powered. Replacement generic Chinese power brick 11-13V 4-6A.

System: MacPro 3,1 32GB RAM MacOSX El Capitan 10.11.6

Enclosure: Fantom Drives GF500Q

SSD Drive: PNY CS900 120GB SATA III 6Gb/s SSD7CS900-120-RB

Reference Drive: Seagate Momentus 7200.4 500GB

Thanks Adam

  • The manufacturer and model number of the SSD drive in question, as well as the working HD SATA would be nice additions to your question. You're connecting this enclosure to a FireWire port on which model/year of Macintosh? SATA III is capable of backwards compatiblity with SATA II, so perhaps there's some other issue here, perhaps power. – IconDaemon Apr 16 at 18:49
  • Yes of course I should know better than that. Apologies. Whats SE best practice? To edit the original post? I'll add in those details. Thx – Adam Mercado Apr 16 at 19:22

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