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 K2661, as well as specific
sections dealing with the Mac and the K2661.
Disk Size Restrictions
The K2661 can address up to 8 Gigabytes (8 G) of hard-disk space, in 2-G partitions. This is true
for any hard disk formatted with the DOS-compatible FAT-16 format. Hard disks larger than 8 G
can be formatted to make 8 G (in four partitions) accessible to the K2661. If you attach a formatted
disk larger than 8 gigabytes, the K2661 may not be able to work with it; you could reformat the
disk, but this—of course—would erase the disk entirely.
Configuring a SCSI Chain
Here are some basic guidelines to follow when configuring a SCSI chain. For additional
information, refer to:
http://www.kurzweilmusicsystems.com/html/scsi_help.html
http://www.kurzweilmusicsystems.com/html/drive_compatibility_info.html
1. According to the SCSI Specification, 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 first and last devices in the chain must be terminated. The K2661 is peramanently
terminated, so it will always act as an end device on the SCSI chain.
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 K2661 uses active termination of the SCSI bus.
Active termination has some benefits over traditional passive termination. Some people
view active termination as a cure for all SCSI problems, but this isn’t 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 K2661 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.
The majority of SCSI cables we’ve tested were poorly made and could damage data
transferred to and from the disk. Nearly all the SCSI data problems Young Chang’s
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