alternaut, Virtual1, ryck
Thanks for your replies and Disk Warrior it will be. I have "meant to" get it on a couple of occasions in the past, but have procrastinated after Disk Utility seemed to sort things out and lull me into a sense of complacency.
By the way ryck, no, I do not have any other "devices" attached.
Another of my naive/stupid questions :- If one (me) was making another (obviously most recent) back up, can/would the possible underlying problems be copied over e.g. data loss due to bad sectors caused by degradation of the platters or any other such reason.
How dim/vague was that?
Ironically, this evening when I have switched on, the computer started up in "only" 3 minutes and at the moment "everything" seems fine at the moment in "general" use. Mind you, I have not tried FWTDM
or repairing the disk.
Thanks again. Regards. Mike