MP 1,1-5,1 Random SAMSUNG SSD SATA connection Problems on cMP 5,1

[mpilot]

I have random connection Problems with a Samsung SSD 860 QVO 1 TB on a cMP 5,1. The drive is only for backup purposes.

Sometimes when I start up the Mac, it recognizes the drive and somtimes it does not. Then I have to shut off, pull the drive out and put it in again and on reboot the mac recognizes the drive again.

The drive is attached to the internal SATA Port in bay 4. Same behavior in bay 3. So I suppose the problem is not related to the physical SATA-connector. But the SATA-connectors on my 3,1 are quite tighter then the ones on the 5,1. I tried it with 3,5“ adaptor and directly attached. Everytime the same behavior.

On the drive are 3 volumes. 2 APFS Volumes with the ccc-clones of my Mojave and Catalina system volumes and one Mac OS Extended data volume. No file-vault activated.

The real system volumes are located on a NVME-drive connected directly via PCIe.

Is anybody here, who had similar issues or who has a solution for this problem?

 

[MarkC426]

The QVO drives are known to have issues on cMP.
Definitely no good for boot disk.

 

[tsialex]

I have random connection Problems with a Samsung SSD 860 QVO 1 TB on a cMP 5,1. The drive is only for backup purposes.

Sometimes when I start up the Mac, it recognizes the drive and somtimes it does not. Then I have to shut off, pull the drive out and put it in again and on reboot the mac recognizes the drive again.

The drive is attached to the internal SATA Port in bay 4. Same behavior in bay 3. So I suppose the problem is not related to the physical SATA-connector. But the SATA-connectors on my 3,1 are quite tighter then the ones on the 5,1. I tried it with 3,5“ adaptor and directly attached. Everytime the same behavior.

On the drive are 3 volumes. 2 APFS Volumes with the ccc-clones of my Mojave and Catalina system volumes and one Mac OS Extended data volume. No file-vault activated.

The real system volumes are located on a NVME-drive connected directly via PCIe.

Is anybody here, who had similar issues or who has a solution for this problem?

Samsung QVOs drives are not compatible with MP5,1. You can use it connected to an USB-to-SATA adapter or an USB dock, but you can't use a QVO connected to a SATA port - native (south bridge) or not (PCIe adapter).

 

[mpilot]

Thank you for your quick replies. Seems I bought the false ssd. Are the EVO and Pro models safe?

On my 3,1 I have 2 850 EVO on a Sonnet Tempo PCIe to SATA3. They are running without any issues.

 

[tsialex]

Thank you for your quick replies. Seems I bought the false ssd. Are the EVO and Pro models safe?

On my 3,1 I have 2 850 EVO on a Sonnet Tempo PCIe to SATA3. They are running without any issues.

QVO is the cheapest Samsung SSD, with 4-bit per cell NAND and it's completely incompatible with MP5,1 SATA ports. There are some good guesses like Mac Pros not using 3V3 level signal on the SATA port, but it's not confirmed why it won't work.

Replace it with an EVO or a PRO, both are tried and true with MP5,1.

 

[mpilot]

Ok, then I will do so. Thanks again.