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Cheetah 18FC Installation Guide, Rev. A 23
Enabling and disabling the write cache
Write caching is a feature that allows the drive to transfer write
data to its own cache, tell the controller that the task is complete,
and then actually complete the write at a later time. This
improves write performance by freeing the CPU to go on to its
next command.
Warning.
Information can be lost if you enable write cache
and there is a system failure (for example, power
failure) before the data has actually been physically
written to the disc.
OEM drives are shipped with write cache enabled by default. If
you want to disable the write cache, refer to your system’s drive
controller and software utility documentation. Seagate provides
an ASPI utility that you can use in a PC compatible system to
disable the write cache. It is available on Seagate’s CompuServe
forum and on the Seagate BBS (refer to “Seagate Technology
support services” on page 8).
Connecting remote LEDs
You can connect remote LEDs using J6 (see Figure 4).
Connect the anode (usually the longer LED connector) to the
+5V pin, and the cathode to the appropriate LED output pin. For
example, if you want to attach an LED which lights up when the
drive is active (reading or writing), connect the LED’s anode con-
nector to J6 pin 11 and the cathode, through an appropriate
external current-limiting resistor, to J6 pin 8 or pin 12.