[COMP] How does scandisk keep track of bad blocks

With the price of large hdd falling, this is an obsolete hardware question 
but here goes:

Am trying to load linux and or win95b onto lowend machines and trying to keep 
the costs down I have acquired several old hard drives on several boards. 2 
of the hdd have bad blocks, one is an old WD caviar 31200 1.2g and one is a 
Maxtor 7200 2g
wddiag said the WD has bad blocks and repaired them, I then wrote zeros to 
the disk ( it used to have ezbios on it) 
Scandisk thourogh from windows dosent show me anything so I did scandisk from 
the command prompt before windows loaded. It showed 10 bad blocks that it 
said it marked so the OS wouldnt write to those. 

Now that I've formatted and fdisked the drives how would the new OS of my 
choice be made aware of what MS scandisk marked? 
when I formatted the Maxtor drive I saw a message I've never seen before: it 
said something about bad blocks.
So my question is, how does this process work? does linux have a scandisk 
counterpart?
I also recently discovered Norton licenced the original defrag and scandisk 
to M$
Does Norton offer products for linux/unix?

Thanks,
David Bruce, Jr.
icq# 37423206
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