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Since my posting above, I have now discovered that McAfee also scheduled a defrag task without asking me.
The reason that I did not find it before is that it was placed not in the McAfee task scheduler but in the Windows scheduled tasks list. The first run appears to have been scheduled for the 15th of the month and then monthly thereafter.
I have an SSD for my system drive (actually 2 in RAID 0). As a result of the algorithms for distributing data around the discs, the system doesn't know where data are really located anyway, on SSDs. Furthermore, a defrag would tend to reduce the lifetime of the drives. A C: drive defrag for my system is, therefore both pointless and harmful.
Needless to say, I disabled the task. But why did McAfee schedule this in the first place without my permission?