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5.6 TRIM
TRIM is a SATA command that helps improve the read/write performance and efficiency of solid-state
drives (SSD). The command enables the host operating system to inform SSD controller whick blocks
contain invalid data, mostly because of the erase commands from host. The invalid will be discarded
permanently and the SSD will retain more space for itself.
5.7 SATA Power Management Modes
By complying with SATA 6.0 Gb/s specifications, the SSD supports the following SATA power saving
modes:
ACTIVE: PHY ready, full power, Tx & Rx operational
PARTIAL: Reduces power, resumes in under 10 µs (microseconds)
SLUMBER: Reduces power, resumes in under 10 ms (milliseconds)
HIPM: Host-Initiated Power Management
DIPM: Device-Initiated Power Management
AUTO-SLUMBER: Automatic transition from partial to slumber.
Device Sleep (DevSleep or DEVSLP): PHY powered down; power consumption 5 mW; host
assertion time 10 ms; exit timeout from this state 20 ms (unless specified otherwise in SATA
Identify Device Log).
Note:
1. The behaviors of power management features would depend on host/device settings.
2. Device Sleep mode is optional depending on product ordering selections.
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6. Software Interface
6.1 Command Set
Table 6-1: Command set
Code
Command
Code
Command
E5
h
Check Power Mode
F6h
Security Disable Password
90h
Execute Diagnostics
F3h
Security Erase Prepare
E7h
Flush Cache
F4h
Security Erase Unit
ECh
Identify Device
F5h
Security Freeze Lock
E3h
Idle
F1h
Security Set Password
E1h
Idle Immediate
F2h
Security Unlock
91h
Initialize Device Parameters
7xh
Seek
C8h
Read DMA
E
f
h
Set Features
25h
Read DMA EXT
C6h
Set Multiple Mode
60h
Read FPDMA Queue
d
E6h
Sleep
47h
Read Log DMA EXT
B0h
S.M.A.R.T.
2Fh
Read Log EXT
E2h
Standby
C4h
Read Multiple
E0h
Standby Immediate
20 or 21h
Read Sector(s)
C
a
h
Write DMA
40 or 41h
Read Verify Sector(s)
35h
Write DMA EXT
10h
Recalibrate
61h
Write FPDMA Queued
57h
Write Log DMA EXT
3Fh
Write Log EXT
C5h
Write Multiple
30h or 31h
Write Sector(s)
6.2 S.M.A.R.T.
S.M.A.R.T. is an abbreviation for Self-Monitoring, Analysis and Reporting Technology, a self-monitoring
system that provides indicators of drive health as well as potential disk problems. It serves as a warning
for users from unscheduled downtime by monitoring and displaying critical drive information. Ideally, this
should allow taking proactive actions to prevent drive failure and make use of S.M.A.R.T. information for
future product development reference.
Apacer devices use the standard SMART command B0h to read data out from the drive to activate our
S.M.A.R.T. feature that complies with the ATA/ATAPI specifications. S.M.A.R.T. Attribute IDs shall
include initial bad block count, total later bad block count, maximum erase count, average erase count,
power on hours and power cycle. When the S.M.A.R.T. Utility running on the host, it analyzes and reports
the disk status to the host before the device reaches in critical condition.
Note: attribute IDs may vary from product models due to various solution design and supporting
capabilities.
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Apacer memory products come with S.M.A.R.T. commands and subcommands for users to obtain
information of drive status and to predict potential drive failures. Users can take advantage of the
following commands/subcommands to monitor the health of the drive.
Code
SMART Subcommand
D0h READ DATA
D1h READ ATTRIBUTE THRESHOLDS
D2h Enable/Disable Attribute Autosave
D4h Execute Off-line Immediate
D5h Read Log (optional)
D6h Write Log (optional)
D8h Enable Operations
D9h Disable operations
Dah Return Status
General SMART attribute structure
Byte Description
0 ID (Hex)
1 – 2 Status flag
3 Value
4 Worst
5*-11 Raw Data
*Byte 5: LSB
SMART attribute ID list
ID (Hex) Attribute Name
9 (0x09) Power-on hours
12 (0x0C) Power cycle count
163 (0xA3) Max. erase count
164 (0xA4) Avg. erase count
166 (0xA6) Total later bad block count
167 (0xA7) SSD Protect Mode (vendor specific)
168 (0xA8) SATA PHY Error Count
175 (0xAF) Bad Cluster Table Count
192 (0xC0) Unexpected Power Loss Count
194 (0xC2) Temperature
241 (0xF1) Total sectors of write

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