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Interpretation of S.M.A.R.T. Attributes

Device Model	Attributes ID#	Attributes Name	Special	Description
	1	Raw Read Error Rate		Frequency of errors while reading raw data from a disk.
	2	Throughput Performance		Average efficiency of a hard disk.
	3	Spin Up Time		Time needed by spindle to spin-up.
	4	Start/Stop Count		Number of start/stop cycles of spindle.
	5	Reallocated Sector Count		Quantity of remapped sectors.
	6	Start/Stop Count		Number of start/stop cycles of spindle.
	7	Seek Error Rate	(!)	Frequency of errors appearance while positioning.
		I believe that the raw 48-bit Seek Error Rate attribute is encoded as follows: topmost 16 bits=total number of seek errors, bottom 32 bits=total number of seeks. Therefore the Seek Error Rate is equal to ... (total number of seek errors) / (total number of seeks) ​Reference
	8	Seek Time Performance		The average efficiency of operations while positioning.
	9	Power-On Hours Count	(!)	Quantity of elapsed hours in the switched-on state.
		On recent disks, Maxtor has started to use Attribute 9 to store the power-on disk lifetime in minutes rather than hours. In this case, use the: '-v 9,minutes' option to correctly display hours and minutes.
	10	Spin-up Retry Count		Number of retry attempts, that were needed to reach the operational speed of the spindle.
	11	Calibration Retry Count		Number of attempts to calibrate a drive.
	12	Power Cycle Count		Number of complete power on/off cycles of hard disk.
	13	Soft Read Error Rate		Frequency of program errors appearance while reading data from a disk.
<unknown>	192	Power-Off Retract Cycle		Number of power-off cycles.
	193	Load/Unload Cycle Count		Number of cycles into Landing Zone position.
	194	HDA Temperature		Temperature of a Hard Disk Assembly.
<unknown>	195	Hardware ECC Recovered		Frequency of the on the fly errors.
	196	Reallocated Event Count		Number of remap operations. That means replacing a bad sector by one from the spare area.
	197	Current Pending Sector Count		Current number of unstable sectors (waiting for remapping).
<unknown>	198	Offline Scan Uncorrectable Count		Number of uncorrected errors.
	199	UltraDMA CRC Error Rate		Total number of errors CRC during UltraDMA mode.
	200	Write Error Rate		Number of errors while writing to disk (or) flying height (?)
	201	Soft Read Error Rate		Frequency of program errors appearance while reading data from a disk.
<unknown>	202	Data Address Mark Errors		Number of Data Address Mark (DAM) errors (or) vendor-specific.
<unknown>	203	Run Out Cancel		ECC Errors.
<unknown>	204	Soft ECC Correction		Quantity of errors corrected by software ECC.
<unknown>	205	Thermal Asperity Rate (TAR)		Frequency of the thermal asperity errors.
<unknown>	206	Flying Height		The height of the disk heads above the disk surface.
<unknown>	207	Spin High Current		Amount of high current used to spin up the drive.
<unknown>	208	Spin Buzz		Number of buzz routines to spin up the drive.
<unknown>	209	Offline Seek Performance		Drive's seek performance during offline operations. (Relation to Seek Time Performance - #8?)
<unknown>	220	Disk Shift		Shift of disk is possible as a result of strong shock loading in the store, as a result of it's falling or for other reasons (sometimes: Temperature)
<unknown>	221	G-Sense Error Rate		Frequency of mistakes as a result of impact loads as detected by a shock sensor(?).
<unknown>	222	Loaded Hours		Number of hours in general operational state.
<unknown>	223	Load/Unload Retry Count		Loading on drive caused by numerous recurrences of operations, like reading, recording, positioning of heads, etc.
<unknown>	224	Load Friction		Load on drive caused by friction in mechanical parts of the store.
<unknown>	225	Load/Unload Cycle Count		Number of cycles into Landing Zone position.
<unknown>	226	Load-in Time		General time of loading for drive.
<unknown>	227	Torque Amplification Count		Quantity efforts of the rotating moment of a drive.
<unknown>	228	Power-Off Retract Cycle		Number of power-off cycles.
<unknown>	230	GMR Head Amplitude		Amplitude of heads trembling (GMR-head) in running mode.
<unknown>	231	Temperature		Temperature of a drive.
<unknown>	240	Head Flying Hours		Time while head is positioning.
<unknown>	250	Read Error Retry Rate		Number of errors while reading from a disk.

References: ​http://www.ariolic.com/activesmart/smart-attributes/