MIDI, SCSI, and Sample Dumps
SCSI Guidelines
6-1
Chapter 6
MIDI, SCSI, and Sample Dumps
SCSI Guidelines
The following sections contain information on using SCSI with the K2600, as well as speciÞc
sections dealing with the Mac and the K2600.
Disk Size Restrictions
The K2600 accepts hard disks with up to 2 gigabytes of storage capacity. If you attach an
unformatted disk that is larger than 2 gigabytes, the K2600 will still be able to format it, but only
as a 2 gigabyte disk. If you attach a
formatted
disk larger than 2 gigabytes, the K2600 will not be
able to work with it; you could reformat the disk, but thisÑof courseÑwould erase the disk
entirely.
Configuring a SCSI Chain
Here are some basic guidelines to follow when conÞguring a SCSI chain:
1. According to the SCSI SpeciÞcation, the maximum SCSI cable length is 6 meters
(19.69 feet). You should limit the total length of all SCSI cables connecting external SCSI
devices with Kurzweil products to 17 feet (5.2 meters). To calculate the total SCSI cable
length, add the lengths of all SCSI cables, plus eight inches for every external SCSI device
connected. No single cable length in the chain should exceed eight feet.
2. The Þrst and last devices in the chain must be terminated. There is a single exception to
this rule, however. A K2600 with an internal hard drive and no external SCSI devices
attached should have its termination disabled. If you later add an external device to the
K2600Õs SCSI chain, you must enable the K2600Õs termination at that time.
ThereÕs a switch on the rear panel of the K2600, which you can use to disable the K2600Õs
termination. We recommend, however, that you leave this switch set to
Auto
, which
enables the K2600 to switch termination on or off depending on your SCSI conÞguration.
Poor termination is a common cause of SCSI problems. Having more than two terminators
on the bus will overload the bus drivers, but this should not cause permanent damage to
the hardware. Poor termination can corrupt the data on your disk, however, as can bad
SCSI cables.
A note about active termination: The K2600 uses active termination of the SCSI bus.
Active termination has some beneÞts over traditional passive termination. Some people
view active termination as a cure for all SCSI problems, but this isnÕt true. Active
terminators are appropriate at the end of a SCSI chain. All APS SR2000-series external
drives use internal active termination that can be switched on or off.
3. Each device in the chain (including internal hard drives) must have its own unique
SCSI ID. The default K2600 ID is 6. Macintoshes
¨
use 7 and 0.
4. Use only true SCSI cables: high quality, twisted pair, shielded SCSI cable. Do not use
RS432 or other nonSCSI cables.
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