How many drives can be mounted?

When I plugged in a thumb drive (32GB) it kicked off my 1.5 TB time machine drive.  Both were on a external USB powered Hub.  Is there a limit on how many drives can be mounted?

There's a theoretical limit of 127 items on one USB bus so you were quite far from the limit (though I know of no one who has come close to that limit!). Is your TM drive self powered or bus powered? If bus powered I'd suspect that maybe the hub isn't supplying enough power or maybe has become unplugged from its power supply.
BTW have you tried again? Is this a repeatable event?

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