So my recommendation would be Seagate spinner, USB powered, max 4TB and a second one with the same data fully backed up. I recently also looked at reliability of SSD vs spinner drives expecting SSD's to be more reliable, but that doesn't seem to be the case. There is no 100% way to predict a drive failure or partial failure. Other than that, I decided to not get any external bigger than a 4TB USB powered one and back that up fully. When you mount a volume, it will enable you to access its contents. When booting into single user mode, Linux will not mount anything. If the external hard drive connected to your Mac is still not showing up in Finder but visible in Disk Utility, it might not be necessarily mounted.
EXTERNAL HARD DRIVE FOR MAC NOT MOUNTED PC
The reliability of the actual spinner drive is pretty much the same between Seagate and WD, but in my experience, that was not the main cause of the failures I had. You could put a hard drive, one at a time, in another PC and check the SMART status. Seagate still uses SATA drives and a SATA/USB bridge for externals so now I'm using those. I found out a while back that many of the WD external drive sare no longer SATA drives with a SATA/USB bridge (which was the part that had failed for me in at least three cases), but the drives have a direct USB interface, so when the drive does fail there is no intermediate replacable electronics that could be the cause of the failure. When I took the failed SATA drive out of the enclosure and either mounted it in a new SATA/USB enclosure or even just a SATA/USB interface, the drive worked fine. Microsoft NTFS for Mac by Tuxera (Shareware) Do everything with Windows drives on your Mac. Both are must try application and one can easily mount External hard drive and transfer or edit files and folders. Check your Hard disk speed on Ubuntu with Benchmark.
Main reason was that most of the external drive failures I have had, and there were actually only a few, turned out not to be the actual drive itself, but the USB-SATA bridge in the enclosure. Steps to Recover Data Quickly after Hard Drive Crash. I used to buy WD pretty much exclusively and also Toshiba, but switched to Seagate in the last few years.
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