So: the operation was a success but the patient died. Shirt-Pocket got back to me and suggested I try reinstalling Catalina directly on the internal hard disk. SysInfo doesn't report a rotational speed I'm guessing that this is due to the USB connection. I understand that G-Tech is a brand of Western Digital, so it surprises me that they would use a Hitachi disk instead of one of their own. It looks to me like this is a Hitachi disk drive. System Information reports the following: There is a marking on the bottom that says 'GD4 2000', but it is not identified as a model number. I can't see a model number on the G-Tech unit, at least not anything identifying something as a model number. I had previously formatted the hard disk from the external disk version of Catalina using its Disk Utility software. I'm curious as to why it says, just above, that the partition map type is 'Unknown' when up in the SATA/SATA Express section, it says the partition map type is 'GPT (GUID Partition Table)'.

Partition Map Type: GPT (GUID Partition Table) Is there maybe something about the internal hard disk that is not compatible with Catalina? Here is the output from System Information about the hard disk taken from the operational Catalina system: I subsequently installed Catalina to the external hard disk without incident.Įvery OS that I restore to the hard disk boots up properly - except Catalina. When I first tried to install Catalina, I booted up into my El Cap partition on the external drive, wiped the hard disk clean, pointed the Catalina install to the hard disk, and when it came to the first reboot, it hung - I let it sit there for almost 15 minutes, and finally abandoned that install, restored El Cap to the hard disk, and came back up as normally. So I restarted and came up on NewOs - on the USB-connected external drive - and I was up and at it in less than a minute. From the time my login prompt appeared until the desktop was fully populated was nearly 10 minutes, apps still take ages to open, and mail does not display content of any email that I open. I let it sit overnight, and then rebooted first thing the next morning.

Clone mac hard drive to ssd catalina