HardDisk 技術

最後更新: 2019-04-12


  • Power Consumption
  • HGST - HelioSeal Technology
  • Harddisk 's Service Area (SA)
  • NCQ (Native Command Queuing)
  • SATA revision
  • 512n

Power Consumption


Sequential Read / Write Power Consumption

4TB WD Gold (9.0 W / 8.7 W)

8TB WD Gold (7.2 W / 7.0 W)


HGST - HelioSeal Technology


Because helium is only 1/7th the density of “regular air”, it allows for less friction delivering the following benefits :

The lower friction reduces the amount of power required to spin the platters, reducing both energy costs and thermal output.

Internal turbulence is greatly reduced, allowing for more precise and reliable tracking. This allows for greater areal density.

The lower power requirement and internal turbulence allows more platters and heads to be added in the same volume of space.

The completely sealed environment eliminates reliability issues that can occur if breather filters get clogged up with dirt.

Harddisk 's Service Area (SA)



NCQ (Native Command Queuing)


需硬碟韌體, 硬碟控制器以及作業系統三者的互相配合


SATA revision


Power Requirement: +5V, +12V

SATA revision 1.x => 1.5 Gbit/s, 150 MB/s

SATA revision 2.x => 3 Gbit/s, 300 MB/s

SATA revision 3.x => 6 Gbit/s, 600 MB/s

SATA revision 3.1
 - mSATA
 - Queued TRIM Command

SATA revision 3.2
 - SATA Express (16 Gbit/s, 1969 MB/s)
 -  SATA M.2
 - microSSD introduces a ball grid array

SATA revision 3.3
 - support Shingled magnetic recording (SMR)  
 - "Power Disable" feature allows for remote power cycling of SATA drives


Check SATA port version



dmesg | grep SATA

[    1.916706] ahci 0000:00:1f.2: AHCI 0001.0300 32 slots 6 ports 6 Gbps 0x3 impl SATA mode
[    1.922904] ata1: SATA max UDMA/133 abar m2048@0xf7d16000 port 0xf7d16100 irq 43
[    1.922905] ata2: SATA max UDMA/133 abar m2048@0xf7d16000 port 0xf7d16180 irq 43
[    2.242265] ata1: SATA link up 6.0 Gbps (SStatus 133 SControl 300)
[    2.252315] ata2: SATA link up 1.5 Gbps (SStatus 113 SControl 300)


smartctl -i /dev/sda | grep SATA
SATA Version is:  SATA 3.1, 6.0 Gb/s (current: 6.0 Gb/s)


hdparm -I /dev/sda | egrep "speed|Transport"

        Transport:          Serial, SATA 1.0a, SATA II Extensions, SATA Rev 2.5, SATA Rev 2.6, SATA Rev 3.0
           *    Gen1 signaling speed (1.5Gb/s)
           *    Gen2 signaling speed (3.0Gb/s)
           *    Gen3 signaling speed (6.0Gb/s)
           *    SMART Command Transport (SCT) feature set


SATA Version is:  SATA 3.0, 6.0 Gb/s (current: 3.0 Gb/s)

motherboard issue






n = native