Seagate ST36450A, Product Manual

Page: 16 / 52

from the start of a read until the buffer segment is full or until another
command is received.
Write immediate. The drive uses the write segment to store write
commands and data. After the drive receives all of the data for the
command, it issues a write complete. Then, the drive writes the data to
the disc.
Write merging. The drive accepts contiguous write commands and
executes them as one command.
1.7 Start and stop times
Within 20 seconds after power is applied, the drive is ready. Within 15
seconds after power is removed, the drive spindle stops rotating.
1.8 Typical power-up and power-down sequence
This section describes typical power-up and power-down sequences to
assist you in evaluating the drive’s performance. They are not perform-
ance specifications. A typical startup current profile is shown in Figure 1.
Startup current profiles are unique for each drive.
2 4 6 8 10 12 14 16
1.0
1.5
2.0
2.5
3.0
3.5
Time (seconds)
Current (Amps)
0
0
18
Figure 1. Typical startup current profile
8 Medalist Pro 6450/6451 Product Manual, Rev. B