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If the drive itself is inherently reliable but has some bad sectors, then TLER and similar features prevent a disk from being unnecessarily marked as 'failed' by limiting the time spent on correcting detected errors before advising the array controller of a failed operation. The array controller can then handle the data recovery for the limited amount involved, rather than marking the entire drive as faulty.
==Desktop Computers and TLER Effect==
Effectively, TLER and similar features limit the performance of on-drive error handling, to allow RAID controllers to handle the error if problematic. In a non-RAID environment, such features are unhelpful, and manufacturers do not recommend their use.
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By default, Western Digital [http://www.westerndigital.com/en/products/index.asp?Cat=2&Language=en Enterprise Drives] such as Raptor, Caviar RE2 and RE2-GP (RAID Edition) come with TLER Read "Disabled" (0 seconds) and TLER Write "Enabled" (7 seconds) while [http://www.westerndigital.com/en/products/index.asp?Cat=3&Language=en Desktop Drives] such as Caviar SE, SE16, and GP come with TLER Read and Write Disabled (0 seconds).
The ability to change the TLER option on Western Digital Desktop and Enterprise hard drives coincides with the current trends in desktop computing allowing the user to have the flexibility in upgrading from a single desktop class hard drive to two or more such drives in the future because of most of the motherboard manufacturer's include on-board RAID controllers as part of their standard chipsets allowing easy upgrades. At the same having this choice gives the user the flexibility of purchasing the performance drives such as the Western Digital Raptor and using it for single drive stand-alone usage and disabling the TLER option to enable better data recovery and lower chance of corruption and drive failures.
== Stand-Alone vs RAID Hard Disk Usage Considerations ==
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