3. CONFIGURING YOUR SCSI CARD
DC-390 Series User’s Manual
21
21
INT13 Extension:
Enabled (default)/Disabled. When
enabled
, the DC-390 will support more
than 1024 cylinders for use with operating systems supporting the INT13 Extension. The
conventional INT 13H disk interface supports a maximum of only 1024 cylinders. For
operating systems such as
Win95 OSR2 or later
, supporting
INT13 Extension
, the DC-390
will support
>1024 cylinders
by using the Command Packet Mechanism instead of the
cylinder/head/sector mechanism and thus work with SCSI disks
greater than 8GB
.
•
For operating systems not supporting the INT13 Extension this option will be ignored.
•
This setting is not to be confused with Greater Than 1GB Support, which simply remaps
the device’s parameters to compensate for the 1024 cylinder limit. Greater Than 1GB
Support can handle drives
up to 8GB
in size due to fact that the maximum
cylinders/heads/sectors is 1024/255/63 = 8GB. INT13 Extension supports
drives
beyond
8GB
in supported operating systems by using the Command Packet Mechanism.
Greater Than 1G Support:
Enabled/Disabled. FAT (File Allocation Table) file system
Operating Systems such as DOS have traditionally imposed a barrier on the number of
cylinders supported (1024). The option "Greater Than 1GB Support" in the Tekram BIOS
should be enabled if any device has more than 1024 cylinders IF you are using a FAT file
system (DOS, Windows 3.X, Windows 95). Some Operating Systems such as OS/2 and
Windows NT can use either FAT or HPFS/NTFS respectively. For these Operating Systems,
the Greater Than 1GB Support feature only needs to be enabled if FAT is to be used as the
file system. *NTFS and HPFS do not impose a 1024 cylinder limit.
•
Netware and UNIX are two Operating Systems that do not have a 1024 cylinder barrier
and therefore do not require that Greater Than 1GB Support be enabled.
•
If your HDD was formatted without Greater Than 1GB Support enabled originally, you
will have to backup the data and re-FDISK the drive in order to use the maximum
capacity under DOS or any Operating System using FAT.
•
Enabling the
Greater than 1G support
option will reassign the parameters to 512Bytes
per Sector, 63Sectors and 255Heads for SCSI disk drives with a capacity larger than 1
GByte. This allows the operation of hard drives with a capacity up to 8GByte with
operating systems such as DOS, Windows 95, etc.
•
For drives smaller than 1GByte, the 64Head/32Sector translation scheme will always be
employed, regardless of this option being enabled or not.
More Than 2 Drives Support:
Enabled/Disabled. When enabled, this option provides
support of up to eight devices (controlled by BIOS INT 13H ), such as IDE/ESDI/ST506/
SCSI fixed disks, removable cartridges, and re-writable optical disks (MO) without the need
for device drivers under DOS 5.0 or above. This setting may be disabled under other
operating systems than DOS. Under DOS environments, the devices connected to the DC-
390 can be controlled through BIOS INT 13H or device drivers. When the option “Included
in BIOS Scan” is set to Yes, that device is controlled by BIOS INT 13H. If this option is set
