Hello
I d like to share a weird thing I came across with the above aforementioned disk. I have two of these
WDC WD40PURZ-85AKKY0
WDC WD40PURZ-85TTDY0
both are purple 4tb drives. Before use them in an array (along with other 4tb drives) I wanted to check the drives and started with most simple one to check the attributes of the drives with
smartctl -i /devsd(whatever letter is being recognised) and I noticed that from the
WDC WD40PURZ-85AKKY0 specs
Model Family: Western Digital Purple
Device Model: WDC WD40PURZ-85AKKY0
Firmware Version: 80.00A80
User Capacity: 4,000,787,030,016 bytes [4.00 TB]
Sector Sizes: 512 bytes logical, 4096 bytes physical
Rotation Rate: 5400 rpm
Form Factor: 3.5 inches
Device is: In smartctl database [for details use: -P show]
ATA Version is: ACS-3 T13/2161-D revision 5
SATA Version is: SATA 3.1, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is: Fri Jan 15 01:37:42 2021 EET
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
capabilities: (0x11) SMART execute Offline immediate.
No Auto Offline data collection support.
Suspend Offline collection upon new
command.
No Offline surface scan supported.
Self-test supported.
No Conveyance Self-test supported.
No Selective Self-test supported.
SMART capabilities: (0x0003) Saves SMART data before entering
power-saving mode.
Supports SMART auto save timer.
Error logging capability: (0x01) Error logging supported.
General Purpose Logging supported.
Notice the 4 No’s referring to
No Auto Offline data collection support.
No Offline surface scan supported.
No Conveyance Self-test supported.
No Selective Self-test supported
While the other drive WDC WD40PURZ-85TTDY0 exact same model - same firmware has them as supported according to this
Model Family: Western Digital Purple
Device Model: WDC WD40PURZ-85TTDY0
Firmware Version: 80.00A80
User Capacity: 4,000,787,030,016 bytes [4.00 TB]
Sector Sizes: 512 bytes logical, 4096 bytes physical
Rotation Rate: 5400 rpm
Form Factor: 3.5 inches
Device is: In smartctl database [for details use: -P show]
ATA Version is: ACS-3 T13/2161-D revision 5
SATA Version is: SATA 3.1, 6.0 Gb/s (current: 6.0 Gb/s)
Local Time is: Fri Jan 15 01:36:12 2021 EET
SMART support is: Available - device has SMART capability.
SMART support is: Enabled
capabilities: (0x7b) SMART execute Offline immediate.
Auto Offline data collection on/off support.
Suspend Offline collection upon new
command.
Offline surface scan supported.
Self-test supported.
Conveyance Self-test supported.
Selective Self-test supported.
SMART capabilities: (0x0003) Saves SMART data before entering
power-saving mode.
Supports SMART auto save timer.
Error logging capability: (0x01) Error logging supported.
General Purpose Logging supported.
How can that be? Are these attributes
Auto Offline data collection support.
Offline surface scan supported.
Conveyance Self-test supported.
Selective Self-test supported
enabled-disabled from the underlying OS or with smartctl commands?
After that I also checked 2 skyhawk devices also 4tb and asked some friends of mine with purple ones and all supported those 4 attributes.
Do you have any idea what is happening here?
