Substituting DSHD for DSDD disks (or DS2D if you prefer)

[Fred Cisin]

>> 82901A and the HP 9121D now work great. Quite low capacity (270k?) due to 
>> the weird LIF formatting, formats 35 tracks but uses only 33, out of the 
>> 40. I wonder why.
> Partially because the original 5.25" drives (Shugart SA400) were 35 track (#0 
> - #34), not 40.

I don't even remember, . . . 
Does LIF also reserve some space for substitution for bad sectors?
(there were a higher percentage in those days)