On a related note:
Last week I bought from B&H a "Transcend 256 GB SSD 370 (TS256GSSD370)" which is on BMD's current list of SSDs certified for ProRes recording in the BMPC-4K. My camera is running 1.9.10 firmware, the most current version for the BMPC-4K.
https://www.blackmagicdesign.com/support/faq/59007Note: This disk is a "thin" form factor drive (7mm?), and does NOT ship with a plastic shim/spacer to prevent it from wobbling around inside a BMPC-4K or BMCC camera.
As expected, I got the "No SSD" prompt when I first inserted the drive in my camera. But the "Format Disk" button was greyed-out in the cam's menu, no matter what recording format or fps was selected, and the cam wouldn't record onto the disk.
I was able to format the SSD on my Mac using 2 different drive docks, both exFat & HFS+. But the camera still reacted to the disk with the No SSD prompt, and couldn't format or record on the disk.
I returned the Transcend disk to B&H for a full refund, and ordered from them a "Kingston 240 GB HyperX 3K (SH103S3/240G)". I already own one of these disks and it's always worked perfectly for ProRes recording in my BMPC-4K. Only reason I tried the Transcend is because it was a lot less expensive than the Kingston. The Kingston 240 GB HyperX 3K is a "9mm" thickness drive, so it fits inside my camera perfectly; nice and snug. The Kingston 240 GB HyperX 3K drive I received from B&H today formats & records ProRes in my BMPC-4K without any problems.
I don't know if the "Transcend 256 GB SSD 370 (TS256GSSD370)" I bought was defective, or if Transcend has changed the drive since BMD tested them. I didn't bother checking if Transcend has a firmware update for the drive; I probably should have, but I didn't like the idea of using a thin SSD without a shim/spacer in my BMPC-4K.
YMMV.
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