Maxtor D540X-4K Product Manual page 42

Specifications
7. Standby is the condition at which the microprocessor is powered, but not the
HDA. When the host sends the drive a shutdown command, the drive parks the
heads away from the data zone, and spins down to a complete stop.
8. After this time it is safe to move the disk drive
9. Average random seek is defined as the average seek time between random logical
block addresses (LBAs).
   2 1 9 ' 4
The Maxtor D540X-4K 20.4/40.0/60.0/80.0 GB AT hard disk drives operate from
two supply voltages:
• +12V ±10%
• +5V ±5%
The allowable ripple and noise is 250 mV peak-to-peak for the +12 Volt supply and
150 mV peak-to-peak for the +5 Volt supply. The allowable ripple noise for each
voltage is measured at the power supply with the drive not attached to it.
     2 Q Y G T 5 G S W G P E K P I
You may apply the power in any order, or open either the power or power return
line with no loss of data or damage to the disk drive. The drive can withstand transient
voltages of +10% to -100% from nominal when powering up or down. However, data
may be lost in the sector being written at the time of power loss. Also if power voltage
dwells in the range around reset (9.2 - 9.7 V at 12 V or 3.4 - 4.0 at 5 V) for several
seconds, the drive may disable itself. These voltages are outside expected operational
limits. However, they will occur during testing. To avoid this event during the testing
of reset limits, increase line voltages in 200 mV increments.
When powering up, the drive remains reset (inactive) until both rising voltage
thresholds reset limits are exceeded. When powering down, the drive becomes reset
when any supply voltage drops below the falling voltage threshold.
& % 8 1 . 6 # ) '
+5 V
+12 V
4-6 Maxtor D540X-4K 20.4/40.0/60.0/80.0 GB AT
Power Reset Limits
6 C D N G  
6 * 4 ' 5 * 1 . &
V L T = 4.10 V minimum
V H T = 4.10 V maximum
V L T = 9.30 V minimum
V H T = 10.45 V maximum
* ; 5 6 ' 4 ' 5 + 5
75 mV (typical)
425 mV (typical)