Power Mode Transition Times; Graceful Power-Off Requirements - Western Digital WD Blue 3D NAND SATA SSD User Manual

Form Factor Input
Voltage
M.2 2280 3.3V ± 5%

Power Mode Transition Times

The following table specifies the transition times between the DEVSLP and active
power states.
Power Mode
DEVSLP (Resume)

Graceful Power-off Requirements

On most operating systems, Write Cache is enabled by default. This is a feature of
the ATA standard and is not specific to WD Blue 3D NAND SATA SSDs. There may
be data residing in the WD Blue 3D NAND cache that have not been written to the
flash memory. To ensure that the data is properly committed to flash memory, the
WD Blue 3D NAND requires a STANDBY IMMEDIATE command before power down.
This command instructs the WD Blue 3D NAND SATA SSD to write all of its volatile
data cache to flash memory and returns a GOOD status to the host after its
successful completion. This command is handled transparently by most operating
systems during the shutdown sequence (e. g., hibernation, shutdown, and
standby).
However, if power is lost without warning – leading to an ungraceful shutdown –
data loss may occur. This may also lead to a longer power-on time for the
subsequent power-up.
WD Blue 3D NAND SATA SSD
User Manual
Power Mode 250GB
DEVSLP 1.6mA
(Current)
250GB 500GB
72ms 79ms
500GB 1TB
1.5mA 1.5mA
1TB 2TB
104ms 131ms
Power Characteristics
2TB
1.5mA
13