HardDisk 技術





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)


* 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.



It doesn’t actually use any additional components, just the SDRAM cache and the hard disk drive platters. This is how it works :

    Small media cache areas are created in regular intervals across the platter. These are only visible to the drive controller, and are hidden to the computer and operating system.
    Data that are written to the SDRAM cache are combined and regularly written down to the nearest media cache areas at a higher internal queue depth.
    These dispersed media caches boost write performance by greatly reducing head movements as data is written to the drive.
    The write data is simultaneously de-staged, which eliminates burst activity and their impact on reads from the platter.
    In the event of a sudden power-off event, the media cache areas can quickly restore the SDRAM cache.



SATA revision


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