Scrub free disk blocks

[Hiisi]

2010/8/29 Alan Cox <alan at lxorguk.ukuu.org.uk>:
<--SNIP-->
>
> Modern drives support a secure erase/wipe feature (see hdparm). It's
> probably the best option you get short of doing what probably would have
> been smartest - encrypting it at install time ;)
>
<--SNIP-->
>
> Alan

I always wondered would drive encryption significantly reduce access
speed? For example, if I have an old Pentium III computer with 500 Mhz
processor is it fast enough to be used with encrypted file system?
-- 
Hiisi.
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