If the Sony HD MiniDV camcorder recorded standard definiton, DV, to the miniDV tape, then a non-high def miniDV tape based camcorder should be able to read it just fine.

If the Sony HD MiniDV camcorder recorded high definiton, HDV, to the miniDV tape, then the non-high def miniDV tape based camcorder will not understand that HDV information on the miniDV tape.

In either case, lock the miniDV tape before putting it anywhere - this will prevent data on the tape from being over-written.