Hello ( A small Query Relate to BIOS) Please Do Help

[Aditya Kapoor]

I have few small query which i hope you wont mind to answer
I would be extremely grateful to you if you would answer

Query: When I try to get Drive parameter for a disk
using INT 13h ah= 48h 
Does the value Zero(0) at offset 26 of resulting buffer(pointed to by
DS:SI) mean that the Disk is SCSI 

Query: Why Do we get FFFF:FFFFh at the
OFFset 26 of same buffer in some case even when bios Reports
that its version is 3.0


Thanks
Aditya Kapoor