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Western Digital now claims that using the WDTLER.EXE tool on newer drives can damage the firmware and make the disk unusable. The WDTLER.EXE tool is no longer available from Western Digital, and new disks will not be able to have the TLER setting changed. RE disks are only suitable for RAID arrays and Caviar are only suitable for non-RAID use. The utility still works for older disks.
Below is the WDTLER output for Western Digital Caviar SE16 320 GB and 500 GB hard disk for the default TLER configuration before and after TLER has been Enabled.
'''Before - TLER Read & Write: Disabled'''
<pre>
WDTLER Version 1.03
Copyright (C) 2004-2006 Western Digital Corporation
Western Digital Time Limit Error Recovery Utility
Model: WDC WD3200KS-00PFB0 Serial Number: WD-WCAPD1234567
Read TLER is disabled.
Write TLER is disabled.
Model: WDC WD3200KS-00PFB0 Serial Number: WD-WCAPD1234567
Read TLER is disabled.
Write TLER is disabled.
Model: WDC WD5000KS-00MNB0 Serial Number: WD-WMANU1234567
Read TLER is disabled.
Write TLER is disabled.
Model: WDC WD5000KS-00MNB0 Serial Number: WD-WMANU1234567
Read TLER is disabled.
Write TLER is disabled.
</pre>
<small>''Legend: WD3200KS - Western Digital Caviar SE16 320 GB, WD5000KS - Western Digital Caviar SE16 500 GB''</small>
<!-- Text Output from DOS applications is considered "computer generated screen output" and usage is considered "fair use" under copyright law. The Copyright notice shown is "screen output" from the copyrighted WDTLER utility and not the screen output. -->
'''After - TLER Read & Write: 7 seconds'''
<pre>
WDTLER Version 1.03
Copyright (C) 2004-2006 Western Digital Corporation
Western Digital Time Limit Error Recovery Utility
Model: WDC WD3200KS-00PFB0 Serial Number: WD-WCAPD1234567
Read TLER time is 7.000 seconds.
Write TLER time is 7.000 seconds.
Model: WDC WD3200KS-00PFB0 Serial Number: WD-WCAPD1234567
Read TLER time is 7.000 seconds.
Write TLER time is 7.000 seconds.
Model: WDC WD5000KS-00MNB0 Serial Number: WD-WMANU1234567
Read TLER time is 7.000 seconds.
Write TLER time is 7.000 seconds.
Model: WDC WD5000KS-00MNB0 Serial Number: WD-WMANU1234567
Read TLER time is 7.000 seconds.
Write TLER time is 7.000 seconds.
</pre>
<small>''Legend: WD3200KS - Western Digital Caviar SE16 320 GB, WD5000KS - Western Digital Caviar SE16 500 GB''</small>
<!-- Text Output from DOS applications is considered "computer generated screen output" and usage is considered "fair use" under copyright law. The Copyright notice shown is "screen output" from the copyrighted WDTLER utility and not the screen output.-->
Note: Western Digital (1.5TB Green Power) WD15EADS-00P8B0 (Nov 2009) drives do not support TLER. WD15EADS-00S2B0 (Feb 2010) models do support TLER.
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