Spinrite functionality on the Mac (low level hard disk sector maintenance)?

Only way it to pull drive out and put it into a PC and use SpinRite.

Stefsun - I respectfully suggest you do a bit more research before you trust your data to S.M.A.R.T.

A small company named GOOGLE had these observations:

Given the lack of occurrence of predictive SMART
signals on a large fraction of failed drives, it is unlikely
that an accurate predictive failure model can
be built based on these signals alone.

Out of all failed drives, over 56% of them have no
count in any of the four strong SMART signals, namely
scan errors, reallocation count, offline reallocation, and
probational count. In other words, models based only
on those signals can never predict more than half of the
failed drives.

We find that
failure prediction models based on SMART parameters
alone are likely to be severely limited in their prediction
accuracy, given that a large fraction of our failed drives
have shown no SMART error signals whatsoever.

http://research.google.com/archive/disk_failures.pdf

Cheers!