User manual

Burning disks/writing incrementally
iXOS-JUKEMAN 2.2 User Manual Pre.12/97 133
4.12.1 Burning disks (Single Track at Once)
The writing software in iXOS-JUKEMAN can transport the data to be writ-
ten to a CD, PD, WORM or MO recorder drive. To actually burn a disk,
you need the writing software cdglow together with iso9660, the latter
used to generate the required standard ISO 9660 file system. Windows
NT also supports the burning of disks from the GUI.
cdglow
Please read the following before attempting to burn a disk:
Burning disks requires a steady stream of data at a constant rate. CD re-
corders which operate at the basic speed require a data transfer rate of
150 kB per second. With dual- and quad-speed recorders, the required
data transfer speed is 300 and 600 kB per second respectively. If the data
available in the internal buffer of the CD recorder is not sufficient to
maintain this rate, then the burning process is prematurely interrupted
with the SCSI error message: “buffer underrun” and the CD can no
longer be used.
iXOS-JUKEMAN is designed to fully exploit the features of the controlled
devices. However, it cannot compensate for an insufficent hardware set-
up or operating errors.
The following errors typically cause such buffer underrun errors:
• If the data source is not directly connected to the jukebox, i.e. if
the data is being transferred over a network.
• If you are copying data from a CD drive, whose speed is the same
or less than that of the recorder drive. An example of this is if you
copy data from a quad-speed to the Brenner Yamaha CDE 100 II
with variable speed capability. In this case however, it is possible
to reduce the effective recording speed with the cdglow options -
f1 and -f2.
Another cause of error is when there are too many devices attached to the
same SCSI controller as that used by the CD recorder. Some recorders
cannot even operate if there are other devices attached to the same con-
troller. In this case it is required to use separate controllers for the read
drives and the recorder drive. In some cases, however, this problem can
be avoided by giving the recorder drive a higher priority (e.g. 6) than the
other drives.