Prolonging a drive's life

One of the four drives in my system is frequently timing out of late, 
although the operation succeeds on a second attempt:

    Aug 14 13:51:59 aldan kernel: (ada4:ahcich5:0:0:0): FLUSHCACHE48.
    ACB: ea 00 00 00 00 40 00 00 00 00 00 00
    Aug 14 13:51:59 aldan kernel: (ada4:ahcich5:0:0:0): CAM status:
    Command timeout
    Aug 14 13:51:59 aldan kernel: (ada4:ahcich5:0:0:0): Retrying command
    Aug 14 13:59:12 aldan kernel: (ada4:ahcich5:0:0:0): FLUSHCACHE48.
    ACB: ea 00 00 00 00 40 00 00 00 00 00 00
    Aug 14 13:59:12 aldan kernel: (ada4:ahcich5:0:0:0): CAM status:
    Command timeout
    Aug 14 13:59:12 aldan kernel: (ada4:ahcich5:0:0:0): Retrying command

While I'm getting a replacement, maybe, I can use camcontrol to somehow 
lower the operating system's exceptions about it? For example, the 
"camcontrol negotiate" returns the following about it:

    Current parameters:
    (pass5:ahcich5:0:0:0): SATA revision: 2.x
    (pass5:ahcich5:0:0:0): ATA mode: UDMA6
    (pass5:ahcich5:0:0:0): ATAPI packet length: 0
    (pass5:ahcich5:0:0:0): PIO transaction length: 8192
    (pass5:ahcich5:0:0:0): PMP presence: 0
    (pass5:ahcich5:0:0:0): Number of tags: 32
    (pass5:ahcich5:0:0:0): SATA capabilities: 00000030
    (pass5:ahcich5:0:0:0): tagged queueing: enabled

Is there anything I can tweak for it to keep working even if at lower 
speeds?

Also, years ago, some BIOSes had the feature, which would "verify" a 
drive -- is there something similar I can trigger with camcontrol or 
smartctl?

Thanks!

    -mi


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