You may wish to check your energy savings settings on your new iMac, to see if you have the external drives set to sleep when not in use. It could be, depending on the drive, that they go to sleep and vanish from the sidebar.

As always, if you change a setting, restarting the computer is the next step.

On 5/15/24 9:50 AM, David J Brooks wrote:
Hi gang

So my new iMac 24" is working reasonably well, and am happy with it so far,
M3 chip.

However I have two older external HDs that are about 6 or 7 years old and a
new external HD that is my new Time machine. My back us are labeled 7 and
7a, for the most part 7 does not show up at all anymore but 7a and time
machine do, but, when i let the machine g to sleep for a while and wake it
up, 7a does not appear and sometime Time machine does not appear in the
side bar.

I have to restart the machine.

OIm using a usb hub to usbC device and have tried directly connecting hd7a
and 7 but with little luck, after waking up 7a does not appear.
I also bought a new cable for the hD'ds.

Any thoughts, is my time machine drive showing up as more stable cause its
new??

Dave

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