advice on disk replacement

[steve%prd.co.uk@localhost (Steve Blinkhorn)]

I got really helpful advice last year concerning bad disk sectors
on my remote servers (Fujitsu Primergy Rx100 D1483).   The opportunity
has come to replace the disks (currently one Seagate ST380011A 80
GByte 7200rpm per machine - the size is adequate to the task), and
I an mindful of the advice to use RAID.  The smallest replacement
I can find is 500Gbyte, and there are only two disk bays in the
chassis.  I'm taking the opportunity to put much more RAM on them
at the same time.

Any advice as to the best way to proceed?

-- 
Steve Blinkhorn <steve%prd.co.uk@localhost>