[comp.os.msdos.programmer] offset 28,29 in BOOT-SECTOR??

nacer@hpmcaa.mcm.hp.com (Abdenacer Moussaoui) (11/06/90)

I would like if one could inform me about the word-value at offset 28
in the BOOT-SECTOR.  So far the only thing I know about it is: "Number
of special reserved sectors"  what are they? bad-sectors? 

I've stubbled on two boot sectors that differ on this value (one 0009
and the other 3000hex=48decimal) although the hard-disks are identical?
So far I believed that similar type hard-disks will have identical
data in offsets 11-29 (hard-disk technical info).  Can someone correct
me on this?

Any information would be appreciated.