Difference between near Line SATA vs Near Line SAS

[jagadish]

I confused between Near line SAS Hard Disk & near line SAS Hard disk.Can i get the technical specification of both.

 

[sminlal]

An SAS disk is an Enterprise-class drive which supposedly has a more robust mechanical specification and a controller/firmware optimized for high-volume I/O, manageability, and better error detection and correction.

A "near line SAS" disk is a standard consumer-class SATA drive with an SAS interface.

 

[fzabkar]

The term, "near line", does not relate to the specification of the hard drive. Instead it refers to a storage or backup philosophy, eg on-line, near-line, off-line.

http://en.wikipedia.org/wiki/Nearline_storage

"Nearline storage (where the word 'nearline' is a contraction of near-online) is a term used in computer science to describe an intermediate type of data storage that represents a compromise between online storage (supporting frequent, very rapid access to data) and offline storage/archiving (used for backups or long-term storage, with infrequent access to data)."

 

[sminlal]

The term, "near line", does not relate to the specification of the hard drive. Instead it refers to a storage or backup philosophy, eg on-line, near-line, off-line.

That's true in a generic sense. But for SAS drives it also has the specific meaning I described. See: http://en.wikipedia.org/wiki/Serial_attached_SCSI#Nearline_SAS