SATA interface running at 3.0 Gb/s with a SATA 6.0 Gbps drive

[Atif]

I have a DNS 320 with Alt-F 1.0

I have a single disk and it's running in SATA 3.0 Gb/s mode, even though the disk is faster.

I understand that with a spinny disk , it probably doesn't really matter, since disk throughput doesn't saturate the interface but I'm bothered why it's not running at 6.0 Gbps

=== START OF INFORMATION SECTION ===
Model Family:     Western Digital Blue
Device Model:     WDC WD5000AZLX-00CL5A0
Serial Number:    WD-WCC3F3191938
LU WWN Device Id: 5 0014ee 2b4a85261
Firmware Version: 01.01A01
User Capacity:    500,107,862,016 bytes [500 GB]
Sector Sizes:     512 bytes logical, 4096 bytes physical
Rotation Rate:    7200 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:    Mon Jun 29 11:48:50 2020 CDT
SMART support is: Available - device has SMART capability.
SMART support is: Enabled

=== START OF READ SMART DATA SECTION ===
SMART overall-health self-assessment test result: PASSED

SMART Attributes Data Structure revision number: 16
Vendor Specific SMART Attributes with Thresholds:
ID# ATTRIBUTE_NAME          FLAG     VALUE WORST THRESH TYPE      UPDATED  WHEN_FAILED RAW_VALUE
  1 Raw_Read_Error_Rate     0x002f   200   200   051    Pre-fail  Always       -       0
  3 Spin_Up_Time            0x0027   175   172   021    Pre-fail  Always       -       2241
  4 Start_Stop_Count        0x0032   097   097   000    Old_age   Always       -       3860
  5 Reallocated_Sector_Ct   0x0033   200   200   140    Pre-fail  Always       -       0
  7 Seek_Error_Rate         0x002e   200   200   000    Old_age   Always       -       0
  9 Power_On_Hours          0x0032   095   095   000    Old_age   Always       -       3850
 10 Spin_Retry_Count        0x0032   100   100   000    Old_age   Always       -       0
 11 Calibration_Retry_Count 0x0032   100   100   000    Old_age   Always       -       0
 12 Power_Cycle_Count       0x0032   097   097   000    Old_age   Always       -       3842
192 Power-Off_Retract_Count 0x0032   200   200   000    Old_age   Always       -       66
193 Load_Cycle_Count        0x0032   199   199   000    Old_age   Always       -       3794
194 Temperature_Celsius     0x0022   116   089   000    Old_age   Always       -       27
196 Reallocated_Event_Count 0x0032   200   200   000    Old_age   Always       -       0
197 Current_Pending_Sector  0x0032   200   200   000    Old_age   Always       -       0
198 Offline_Uncorrectable   0x0030   200   200   000    Old_age   Offline      -       0
199 UDMA_CRC_Error_Count    0x0032   200   200   000    Old_age   Always       -       0
200 Multi_Zone_Error_Rate   0x0008   200   200   000    Old_age   Offline      -       0

SMART Error Log Version: 1
No Errors Logged

[Tom Schmidt]

The DNS-320 SATA speed is SATA II (3.0Gb/s).  SATA III drives (6.0Gb/s) are backward compatible.  Other DNS models such as DNS-323 and DNS-327L are also have SATA II interfaces.

From the internet:

What is the difference between SATA I, SATA II and SATA III?

SATA I (revision 1.x) interface, formally known as SATA 1.5Gb/s, is the first generation SATA interface running at 1.5 Gb/s. The bandwidth throughput, which is supported by the interface, is up to 150MB/s.

SATA II (revision 2.x) interface, formally known as SATA 3Gb/s, is a second generation SATA interface running at 3.0 Gb/s. The bandwidth throughput, which is supported by the interface, is up to 300MB/s.

SATA III (revision 3.x) interface, formally known as SATA 6Gb/s, is a third generation SATA interface running at 6.0Gb/s. The bandwidth throughput, which is supported by the interface, is up to 600MB/s. This interface is backwards compatible with SATA 3 Gb/s interface.

SATA II specifications provide backward compatibility to function on SATA I ports. SATA III specifications provide backward compatibility to function on SATA I and SATA II ports. However, the maximum speed of the drive will be slower due to the lower speed limitations of the port.

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[Atif]

Thank you. I was looking for the SATA version information for DNS 320 but didn't find a source.

Does the SATA speed (3 vs 6 Gbps) matter at all for the NAS since the Gigabit network connection (max 125 MBps theoretical ) will be saturated earlier than SATA ( 300 MBps theoretical ) ?

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