ZyXEL Communications NSA320 manual 283

			Chapter 10 Package Management
Table 81 S.M.A.R.T. Attributes (continued)
ID	ATTRIBUTE	BETTE	DESCRIPTION
	NAME	R
19	Airflow	Low	This indicates the temperature of the airflow measured
0	Temperature		by a Western Digital hard drive.
19	Temperature	High	This indicates the value of 100 - the temperature in
0	Difference		degrees Celsius. Manufacturers can set a minimum
	from 100		threshold that corresponds to a maximum temperature.
19	G-sense error	Low	This is the number of mistakes caused by impact loads.
1	rate
19	Power-off	Low	This is how many times the heads are loaded off the
2	Retract Count		media.
19	Load/Unload	Low	This is the number of load and unload cycles into head
3	Cycle		landing zone position.
19	Temperature	Low	This is the hard drive’s internal temperature.
4
19	Hardware ECC	High	This is the time between ECC (Error Correction Code)-
5	Recovered		corrected errors.
19	Reallocation	Low	This is the total number of reallocation (remap)
6	Event Count		operations. The raw value is the total attempts to move
			data from reallocated sectors to a spare area. Successful
			and unsuccessful attempts are both included.
19	Current	Low	This is the number of unstable sectors awaiting
7	Pending Sector		reallocation. If the sector is later successfully written or
	Count		read, this value decreases and reallocation is not
			performed. Only failed write attempts cause a
			reallocation, not read errors. This can be difficult to test
			since only direct I/O writes to the disk cause
			reallocations, not cached writes.
19	Uncorrectable	Low	This is the number of errors reading or writing a sector
8	Sector Count		that were not correctable. An increase in this value is an
			indicator of disk surface defects or mechanical subsystem
			problems.
19	UltraDMA CRC	Low	This is the number of data transfer errors through the
9	Error Count		interface cable according to the ICRC (Interface Cyclic
			Redundancy Check).
20	Write Error	Low	This is the total number of errors in writing sectors.
0	Rate / Multi-
	Zone Error
	Rate
20	Soft Read Error	Low	This is the number of read/write head off-track errors. If
1	Rate		the value is not zero, make a backup.
20	Data Address	Low	This is the number of data address mark errors. This
2	Mark Errors		could also be a different, manufacturer-specific attribute.
20	Run Out Cancel	Low	This is the number of ECC (Error Correction Code) errors.
3
20	Soft ECC	Low	This is the number of errors corrected by software ECC
4	Correction		(Error Correction Code).

	283
NSA320 User’s Guide