The SMART Attributes list in the DiskCheckup "SMART Info" window contains all SMART attributes supported by the current drive. (See What is SMART? for more information).

Each hard disk manufacturer is free to define their own set of attributes, normalized values and thresholds. Most manufacturers, however, follow a list of known SMART attributes which maps a specific attribute to an attribute ID. The following is a partial list of SMART attributes. Please note that vendors are not required to use the same attribute for a particular attribute ID.
The Attributes
Raw Read Error Rate (ID: 1)
Represents the rate of uncorrected read errors. Lower values indicate that there is a problem with either disk surface or read/write heads.
Throughput Performance (ID: 2)
Represents the throughput performance of the drive. I.e. The speed at which the drive is reading and writing data.
Spin Up Time (ID: 3)
Represents the average amount of time required to spin up the drive spindle to operational speed from a stopped state.
Start/Stop Count (ID: 4)
Represents the number of start/stop cycles for the drive. The raw value indicates the count of start/stop cycles for the drive. The drive being powered on/off or suspended/woken up are considered as start/stop cycles.
Reallocated Sector Count (ID: 5)
Represents the amount of spare sector pool available. Spare sectors are used to replace sectors that became bad for some reason (for instance, if a read error occurs). Therefore the more sectors reallocated, the worse the condition of the drive. A high value represents few reallocated sectors, a low value represents a disk in poor physical condition.
Seek Error Rate (ID: 7)
Represents the number of seek errors. Each time the drive attempts a seek operation, but fails to position its head correctly, the seek error rate increases.
Seek Time Performance (ID: 8)
Represents how efficiently the drive is performing seek operations. A low value indicates problems with the drive subsystem, for instance the servo responsible for positioning the head.
Power On Hours Count (ID: 9)
This is an informative attribute, the raw value of which displays the number of hours the drive has been powered on for.
Spin Retry Count (ID: A)
Represents the number of times a drive fails to spin its spindle up to operation speed on the first attempt. The lower the value, the more retries have occurred.
Calibration Retry Count (ID: B)
Calibration is the act of repositioning the drive read/write head to cylinder 0. This value represents the number of times a calibration has failed on the first attempt.
Power Cycle Count (ID: C)
Informative attribute, the raw value of which represents the number of drive power on/drive power off cycles for the disk.
Temperature (ID: C2)
Informative attribute, the raw value of which represents the current temperature in Celsius of the drive.
Reallocation Event Count (ID: C4)
Represents the number of reallocation events, which have taken place. Sometimes multiple sectors are reallocated together – this corresponds to one reallocation event. (See also: Reallocated Sector Count and Current Pending Sector Count).
Current Pending Sector Count (ID: C5)
Represents the number of sectors currently pending reallocation.
Uncorrectable Sector Count (ID: C6)
The total number of uncorrectable errors when reading/writing a sector.
UltraDMA CRC Error Count (ID: C7)
Represents the number of CRC error found in the Ultra DMA high-speed transfer mode. (CRC stands for Cyclic Redundancy Check and is data verification algorithm which uses polynomial checksums).
Write Error Count (ID: C8)
Represents the rate of uncorrected write errors. Lower values indicate that there is a problem with either disk surface or read/write heads.
GSense Error rate (ID: DD)
The number of errors resulting from externally-induced shock & vibration.
Load/Unload cycle count (ID: DF)
Number of times head changes position.
Power off retract count (ID: E4)
The number of times the magnetic armature was retracted automatically as a result of cutting power.
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