I'd just like to add, OS X is terrible at handling SSDs in UASP connected USB 3 enclosures. So is this drive fine? Has the "bad memory sector" been mapped out and unless I see more errors appear elsewhere I do not need to return it? This thing has a 10 year warranty and I still have 6 years to go. Drive Dx however still warns me that the drive is failing because of the Flash Read Fail Count being 824. A full "surface" scan of the drive did not reveal any errors. I have not seen any more errors and the Flash Read Fail Count is still stuck at 824 but is not incrementing. Mac now recognises it as an SSD with TRIM enabled.
I backed it up and reformatted it with the APFS file system. I put the drive into a Thunderbolt 1/2 enclosure and hooked it up to Mac OS 10.14. The TBW on this drive is on 2.7TB out of 300TBW. Backing up the drive there was one file which was unreadable. Scanning the drive with Techtool Pro 14 also gave an error at 546,559,560. Flash read fail count would increment on Drive Dx. Running the Extended Self Test through Drive Dx gave me Completed: read failure with LBA of 1st error at 546,559,560. These were SMART Flash Read Fail count errors which would increment whenever the OS read a bad section of the SSD.
Mac OS did not recognise this drive as an SSD and did not enable TRIM on this device.Īt some stage I ran Drive Dx which started to report errors. I had the drive in a UASP capable USB 3 enclosure and ran it with Mac OS 10.12 as an external drive for storage. A Samsung 850 PRO 1 TB SSD is constantly reporting pre-fail SMART problems for me on Mac OS 10.14.6 with the Drive Dx app and Techtools Pro 14, SMART check.
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