mvrobinson wrote:
Thanks for your response. Sorry I am not very tech savvy but I'll give it a go!
The SanDisk 1Tb SSD is connected to the back USB port on the Computer which is iMac (Retina 5K, 27-inch, Late 2015),3.2 GHz Quad-Core Intel Core i5, 32 GB 1867 MHz DDR3. The internal drive was replaced with 1Tb SSD when the original failed over 18 months ago. The external HDD is a Seagate Backup Plus Desktop Drive 3Tb connected via USB at the rear of the computer.
The Logitech keyboard has a USB Receiver? plugged into the back of the computer as does the Penguin mouse.
I get the warning messages that both discs have been ejected followed later by the keyboard and mouse freezing, so I have to reboot.
The time period between start up and disc ejection varies but up to about 3 hours?
I hope this is helpful?
Q - " The internal drive was replaced with 1Tb SSD when the original failed over 18 months ago. "
A - One of the few that were successful to Install Monterey to a Non Original Internal Drive
There are reports appearing on the ASC Forums regarding failed installation of Monterey on older Qualifying Apple Computers. In most cases this is related to having a NON Apple Original Internal Drive ?
The EFI Boot ROM included in Monterey is verifying for Original Apple Drive and if not found , may Balk or fail to upgrade to Monterey.
Reports indicate the EFI BOOT ROM is Required to Flash the Computer and is a requirement for a Successful Monterey Installation.
Q - " The SanDisk 1Tb SSD is connected to the back USB port on the Computer "
A - https://www.macworld.com/article/232753/what-to-do-if-your-macs-hard-drive-starts-unmounting-itself-unexpectredly.html
Q - The Logitech keyboard has a USB Receiver? plugged into the back of the computer as does the Penguin mouse.
A - Third Party Bluetooth Devices with Third Party Software to Control the devices is problematic. Would suggest checking with the Developers of each of the two devices for updated or upgrades to there respective software that is specifically Monterey Compatible .