Format of ESDI Drive Configuration Status Block:
Offset	Size	Description	)
 00h	BYTE	09h
 01h	BYTE	number of words in block (06h)
 02h	BYTE	flags
 03h	BYTE	number of spare sectors per cylinder
 04h	DWORD	total number of usable sectors
 08h	WORD	total number of cylinders
 0Ah	BYTE	tracks per cylinder
 0Bh	BYTE	sectors per track