SanDisk Ultra 3D SSD 2 TB not detected by imac 2019 (Catalina 10.15.6.) via thunderbolt 3 port

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SanDisk Ultra 3D SSD 2 TB not detected by imac 2019 (Catalina 10.15.6.) via thunderbolt 3 port

SanDisk Ultra 3D SSD 2 TB not detected by imac 2019 (Catalina 10.15.6.) via thunderbolt 3 port (USB 3.1. 10 GB). I use Cable Matters Aluminum 10Gbps USB C Hard Drive Enclosure for 2.5" SSD/HDD https://www.cablematters.com/pc-1025-129-aluminum-10gbps-usb-c-hard-drive-enclosure-for-25-ssdhdd.aspx

The SSD recognized by USB 3.o. in imac. I also tried the SSD in Windows and it works fine via USB 3.0. and thunderbolt (USB - C). I read about all the possible solutions on the internet but I could not solve the problem. Any idea?

Thank you

Posted on Dec 30, 2020 11:57 AM

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Answer 1

dimitris292 Author

Level 1

8 points

Jan 14, 2021 2:07 AM in response to tbirdvet

Finally it seems that the problem was due to the cable. It was replaced by the company (cable matters) snd now the SSD works perfectly

Thank you

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Answer 2

tbirdvet

Level 6

17,433 points

Dec 30, 2020 4:22 PM in response to dimitris292

I also have a 2019 iMac. I have several SSD's and all work. The one Sandisk I have does not perform well. The read speeds fall off quickly if I connect to USB 3 or TB3 port so I prefer using my Samsung or Crucial SSD's. That being said your Sandick should work. I suspect a cable or enclosure issue.

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Answer 3

dimitris292 Author

Level 1

8 points

Jan 3, 2021 3:20 PM in response to tbirdvet

Thank you for your answer. I tested the read and write speed of SSD with Blackmagic Disk Speed test (430 Mb/s and 420Mb/s). The cablematters company to send me another cable. I hope the problem is solved.

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Answer 4

den.thed

Level 10

93,382 points

Dec 30, 2020 12:31 PM in response to dimitris292

You should contacted CablesMatters on the issue with the enclosure.
Plus I've seen mostly bad reports using SanDisk SSDs as startup drives for Mac's.

Option 1 take/send back that enclosure and try a different USB-C enclosure.

Option 2 take/send back that SanDisk SSD and try another brand like OWC or Crucial.

Option 3 use it connected to USB 3.0, which is a plenty fast enough connection for a SATA SSD.

Option 4 take/send both the Enclosure and the SSD back and purchase the Envoy Pro EX from OWC.

see > https://eshop.macsales.com/shop/owc-envoy-pro-ex-thunderbolt-3?

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Answer 5

dimitris292 Author

Level 1

8 points

Dec 30, 2020 12:58 PM in response to den.thed

Thank you for your answer. I contacted with Cable Matters company but I did not find a solution. Τhe company suggests me to try other cables. I use the SSD as external disk (video editing) and not as a boot disk. Thank you for the options you suggest to me.

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Answer 6

den.thed

Level 10

93,382 points

Dec 30, 2020 2:15 PM in response to dimitris292

You're welcome.

Go with Option 3 use it connected to USB 3.0, which is a plenty fast enough connection for a SATA SSD.

Again, USB 3.0 is plenty fast enough for the 2T SanDisk SATA SSD.

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SanDisk Ultra 3D SSD 2 TB not detected by imac 2019 (Catalina 10.15.6.) via thunderbolt 3 port

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