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The drive supports hot plugging only in systems where a SATA hard drive storage backplane is used.
The SATA 3.0 specification requires staggered pins for both the hard drive and drive receptacles.
Staggered pins mate the power signals in the appropriate sequences required for powering up the hot
plugged device. These pins are also specified to handle in excess of the maximum allowed inrush
current that occurs during drive insertion. SATA-compliant devices thus need no further modification
to be hot pluggable and provide the necessary building blocks for a robust hot plug solution, which
typically includes:
Device detection even with power downed receptacles (typical of server applications).
Pre-charging resistors to passively limit inrush current during drive insertion.
Hot plug controllers to actively limit inrush current during drive insertion.
3.14 Active LED Status
The drive supports external LED requirements. It provides an activity LED output which is ON
during command execution and OFF otherwise.
The drive strength of this open Drain Drive Active signal is that it can sink 12mA to 0.4V Max. It is
5V tolerant, meaning that the external LED may be driven from +5V or +3.3V so long as the Host
system provides a series resistor to limit the LED current to the lower of 12mA or the rated operating
current of the LED. As an example with +5V and a 2 volt forward drop across a 10mA LED, a 300
Ohm 5% 1/16W resistor would be suitable. In the case of a 3.3V supply for the same LED, the resistor
would be 130 Ohm 5% 1/16W.
The pin corresponding to P11 shall be used for Active LED (see "Agency Approvals" on page 16).
3.15 Fluid Dynamic Bearings (FDB)
Bearing design that incorporates a layer of high-viscosity lubricant instead of ball bearings in the hard
drive spindle motor. As an alternative to conventional ball bearing technology, FDB designs provide
increased non-operational shock resistance, speed control, and improved acoustics.
3.16 Staggered Spinup and Activity Indication (SATA Power Pin
11)
SATA device power connector pin 11 (see "Standard Factory Connectors" on page 12) is defined as a
means by the host to DISABLE staggered spinup and it may also be used by the device to provide the
host with an activity indication. According to the SATA spec, "Staggered Spin-up Disable and Activity
Signal shall not be enabled at the same time."
3.16.1 Staggered Spinup
When multiple disks are installed in an enclosure, it is desirable to provide a simple mechanism by
which a subsystem controller can sequence hard drive initialization to minimize the current load
presented during power up. Staggered spinup provides this mechanism by preventing the hard drives
from spinning up until after successful PHY initialization (i.e., after PHY enters DP7:DR_Ready
state).
Staggered spinup is only applicable during initial power-up. If a drive is spun down using ATA
commands—as a result of having been placed in Standby or Sleep power modes, for example—the
drive shall spin up following the rules that govern spinup from low power modes described in ATA/
ATAPI-6 or later.
3.16.2 Activity Indication
The host controller through SATA power pin 11 may access storage device status and activity. The
signal provided by the device for activity indication is a low-voltage low-current signal. It is not suitable
22
RELEASED 8/13/13
EX800M
2679-771339-A05
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