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S.M.A.R.T. attribute meaning
As already said in the short description of the S.M.A.R.T. standard,
each attribute has its own value, meaning, and importance. Unfortunately,
each manufacturer can make extensions to S.M.A.R.T. attributes and most
of them prefer to keeptheir own extensions in secret.
Information in this chapter, in most cases, is unofficial, although
this is true information.
The information below is common for all disk manufacturers meaning
of S.M.A.R.T. attributes.
ID
# |
Attribute name |
Meaning of attribute |
1 |
Raw Read
Error Rate |
Count of non-corrected read errors. More errors
(i.e. lower attribute value) means worse condition of disk surface. |
2 |
Throughput
Performance |
Overall (general) throughput performance of
HDD |
3 |
Spin Up Time |
Average time of spindle spin up time (from
stopped to fully operational) |
4 |
Start/Stop
Count |
Count of spindle start/stop cycles. Raw value
probably shows total number of on/off HDD. |
5 |
Reallocated
Sectors Count |
Count of reallocated sectors. When the HDD
finds a read/write error, it will mark this sector as "reallocated"
and transfer data to the special reserved area. That's why on a modern
HDD you can't see "BAD blocks" while testing the surface - all
bad blocks are hidden in reallocated sectors. The more sectors reallocated
(i.e.lower attribute value), the worse the condition of disk surface. |
7 |
Seek Error
Rate |
Count of seek errors. When your HDD reads
data, it positions heads in the needed place. If there is a failure in
the mechanical positioning system, a seek error arises. More seek errors
(i.e. lower attribute value) - indicates worse condition of a disk surface
and disk mechanical subsystem. |
8 |
Seek Time
Performance |
Performance of seek operations. Shows how
fast seek operations are going. So, if this attribute is lowering, it's
a symptom of bugs in the HDD mechanical subsystem. |
9 |
Power-On
Hours |
Count of hours in power on state. Raw value
of this attribute shows total count of hours (or minutes, or seconds -
it depends on disk manufacturer) in power on state. |
IBM
ID
# |
Attribute name |
Meaning of attribute |
10 |
Spin Retry
Count |
Count of retry of spin start attempts. If
the HDD can't start its spindle on the first try (to make HDD work) it
makes another try - and so on while the spindle will not rotate normally.
This attribute stores a count of start retries. |
12 |
Device Power
Cycle Count |
Count of full HDD power cycle. It probably
means "start - stop" (power on - power off) of HDD. Attribute
importance is identical to "Power-On Hours". |
191 |
Gsense Error
Rate |
|
192 |
Power off
Retract Count |
|
193 |
Load/Unload
Cycle Count |
|
196 |
Reallocation
Event Count |
|
197 |
Current Pending
Sector Count |
|
198 |
Off-Line
Scan Uncorrectable Sector Count |
|
199 |
Ultra DMA
CRC Error Count (Rate) |
Count of errors found in data transfer in
Ultra-DMA (UDMA-33,66,100) mode by CRC (control sum). Just one more method
of error control in data transfer operations, but for high-speed transfer
modes. |
220 |
Disk Shift |
|
221 |
G-Sense Error
Rate |
|
222 |
Loaded Hours |
|
223 |
Load Retry
Count |
|
224 |
Load Friction |
|
225 |
Load Cycle
Count |
|
226 |
Load-in Time |
|
227 |
Torq-amp
Count |
|
228 |
Power-off
Retract Count |
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Fujitsu
ID
# |
Attribute name |
Meaning of attribute |
12 |
Drive Power
Cycle Count |
Count of full HDD power cycle. It probably
means "start - stop" (power on - power off) of HDD. Attribute
importance is identical to "Power-On Hours". |
200 |
Write Error
Rate |
Count of non-corrected write errors. More
errors (i.e. lower attribute value) means worse condition of disk surface. |
Quantum
ID
# |
Attribute name |
Meaning of attribute |
11 |
Recalibration
Retries |
|
12 |
Drive Power
Cycle Count |
Count of full HDD power cycle. It probably
means "start - stop" (power on - power off) of HDD. Attribute
importance is identical to "Power-On Hours". |
|
Soft Read
Error Rate |
|
199 |
Ultra ATA
CRC Error Count (Rate) |
Count of errors found in data transfer in
Ultra-DMA (UDMA-33,66,100) mode by CRC (control sum). Just one more method
for error control in data transfer operations, but for high-speed transfer
modes. |
Unfortunately, as you can see, this table is not complete and, most
likely, on your HDD SIGuardian shows some attributes with the name "Unknown
attribute". It means that we don't have any information about the
name and meaning of this attribute.
This is all because each manufacturer hides information about S.M.A.R.T.
If you have any information (maybe some internal
technical documentation) about the meaning of S.M.A.R.T. attributes in
specific HDD's or specific manufacturers - please, mail mail
us.
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