Tekram Technology DC-820B manual Logical drive scanning sequence

EISA Fast SCSI Caching Adapter

drives) reserved with the driver within 16. This option is important for removable media devices. If you do not reserve enough logical drives for your removable media, it may cause some of the logical drives to go unrecog- nized. To install, add a line after ASPI driver in the CONFIG.SYS:

device=c:\aspi\aspibme.sys

—>device=c:\aspi\diskdrv.sys /d n1 n2 n3 ... n8

n1 logical drives are reserved for 1st physical drive

n2 logical drives are reserved for 2nd physical drive

n3 logical drives are reserved for 3rd physical drive

....

n nx: x = 1 .. 8 and the value of nx ranges from 0 to 9

n nx=0: DC-820B scans the number of logical drives automatically

n the ordering of physical drives starts from primary to secondary and SCSI ID from 0 to 7

It is recommended that DOS 4.x or DOS 5.0 be used. For DOS 3.x, logical drive capacity is limited to 32M bytes or less.

Logical drive scanning sequence

The scanning sequence of SCSI devices that DISKDRV.SYS follows is starting from adapter #0, SCSI ID = 0, primary partition, and then extended partition. Also refer to the I/O port definition for more scanning details.

The following is an example of the scanning sequence with two DC-820Bs. The first one (adapter 0) controls two floppy drives, two BIOS INT 13H controlled SCSI HDDs, one MO device with three logical partitions (drives), and one SCSI HDD. The second one (adapter 1) controls one SCSI HDD with one logical partition, that also is the primary partition. The commands in the CONFIG.SYS would be like this:

device=c:\aspi\aspibme.sys

->device=c:\aspi\diskdrv.sys /d 3 0 0

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