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Re: new harddrive degraded speed

On 2021-01-20 15:21, brainfart@posteo.net wrote:
i bought a new harddrive
western digital red plus 6tb

Model Family:     Western Digital Red
Device Model:     WDC WD60EFRX-68L0BN1
Serial Number:    WD-WX62D60C9L6X
LU WWN Device Id: 5 0014ee 212e6b9ad
Firmware Version: 82.00A82
User Capacity:    6,001,175,126,016 bytes [6.00 TB]
Sector Sizes:     512 bytes logical, 4096 bytes physical
Rotation Rate:    5700 rpm
Device is:        In smartctl database [for details use: -P show]
ATA Version is:   ACS-2, ACS-3 T13/2161-D revision 3b
SATA Version is:  SATA 3.1, 6.0 Gb/s (current: 3.0 Gb/s)
Local Time is:    Wed Jan 20 17:12:52 2021 CST
SMART support is: Available - device has SMART capability.
SMART support is: Enabled

why is the speed 3.0 gbs
i have 4 other drive i have tested with this device and they all  use 6.0 gbs

On 2021-01-20 16:36, brainfart@posteo.net wrote:
> this device is a odroid hc4
> it supports all my other drives a 6.0 gbs
> i used a sata to usb adapter to connect this drive to my pc and it
> connects at 6.0 gbs

> i guess i'm asking what decides how a device is going to connect
> is there a database of devices that the kernel uses
> i should say on my pc - 4.19.0-12-amd64 #1 SMP Debian 4.19.152-1
> (2020-10-18) x86_64
> and the hc4 - 4.9.236-arm64 #1 SMP PREEMPT Sun Dec 20 21:57:12 CET 2020
> aarch64

STFW 'odroid hc4':


The drive firmware and computer kernel negotiate the speed via device drivers and interface chips.

Everything has tolerances. Sometimes, two devices can be within tolerances individually when connected to a test stand, but go out of tolerance(s) when connected to each other. I've seen this with memory modules and motherboards.

As another reader suggested, look for error messages in dmesg(1) and/or /var/log. Post anything interesting.

Does the drive connect at 3 Gbps in both bays?

Do you have another identical drive and/or NAS that you can use for A/B testing?

Can you return the drive or the NAS?


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