Nikon LS-10 Installation Guide for Windows - Manual (Page 44)

Chapter 3 The SCSI Interface
length of all the SCSI cables used in the chain should not exceed 18 feet. A chain of
more than 18 feet may result in lost data and ‘lost’ devices. • System performance can
suffer as devices are added to the SCSI bus. This is related to the length of the SCSI
chain. Data has a longer path to travel as more devices and cables arc added to the SCSI
chain, resulting in electrical instability and signal reflections. This leads to miscommu-
nicated bytes, which must be re-sent until they are received correctly, a lengthy proce­
dure.
3. It is a fast parallel interface.
Advantages: • The complex SCSI protocol, or ‘handshaking,’ is managed in hard­
ware, allowing high speed variable size block transfers. In other words, the SCSI inter­
face allows fast transfer of blocks of data.
Limitations: • The parallel bus limits the length of the SCSI chain, and therefore,
the distance between SCSI devices.
4. SCSI devices can easily be connected, disconnected, and moved.
Advantages: • Allows portability of devices between different computers. •
Allows easy relocation of devices. • Allows easy system expandability.
Disadvantages: • Connecting and disconnecting SCSI devices that reside on the
same SCSI bus as the computer’s bootable disk can cause loss of data or directory infor­
mation, and/or damage to the SCSI devices if performed while the computer or any
device is powered on.
Never connect or disconnect SCSI devices while the computer or any SCSI device
is powered on.
Nikon Coolscan Installation Guide for Windows Page 37