"Disk not ejected properly"

Not allowing me to do a snapshot, tried a picture but its too big a file. My settings for energy saving are;

Computer sleep = 12mins. Display sleep = 12 mins. All ticked: Put hard disks to sleep when possible; wake for network access; Start up automatically after a power failure; Enable Power Nap

I'm running Mac OS High Sierra on the mini; its not a new mini base unit, I was given it and got it formatted, new OS to run my music from; my main Mac is running Monterrey but does not recognise the iPods as they are older iPod touch running OXS 6. I can sync music to the iPods on the Mac mini with an older OS.

On my main Mac I have UNTICKED start after a power failure and have set this on the Mac mini too now.

Have also unticked the put and wake now to see if it helps and have disabled the computer sleep.

Thanks for your help with this, it may be a while before I reply to say if its worked or not because there is NO set time that it ejects it.

Hi, I said I'd get back to you on this problem; it appears to have been remedied! I wanted to wait a while to see if this settled down first and it certainly seems to have, hasn't happened since, so Thank You for your assistance with it, I have noted down the actions or possible actions so that should it happen again I know what to do in future.

On my main Mac (running Monterrey) I have unticked "prevent Mac form sleeping..." and "start up after a power failure" and that seems to work well on this system but I know that Monterrey and High Sierra are completely different set ups, so it didnt work on the Mini.

I have disabled "put to sleep...", "wake..." and "disable Mac sleep..." on the mini and this appears to work well.

Once again, Thank you for your help, much appreciated.

To add to that the schedule is: start or wake every day at 07.00.

Sleep every day at 23.00.