On the PDP11 and VAX, RL, RP, and RM drives require bad block formatting
after an initial attach (that is, creation of a new file). After that,
the question should not be asked again.
The PDP10 operating systems did their own bad block management and did
not require a standard bad block table.
The relevant DEC standard, 144, is here:
http://bitsavers.trailing-edge.com/pdf/dec/standards/EL-00144_B_DEC_STD_144_Disk_Standard_for_Recording_and_Handling_Bad_Sectors_Nov76.pdf
/Bob
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