You ought to describe this old computer, especially the
motherboard make and model - a link to board specs might be
good.
Your link was broken, now fixed.
Try to keep whole link on same line, thanks.
Lower ATA mode just means lower theoretical transfer speed.
They're backwards compatible so an ATA100 drive could run at
fastest speed a board supports, or vice-versa, a newer board
could run a lower ATA rated drive at the fastest speed the
drive supports. More significant is the age of the drive as
it relates to performance or capacity.
Data goes across the cable to the drive and has to be stored
before leaving the drive after read from the platter, or
waiting to be written to the platter.
A larger buffer can improve performance, with 2MB being
typical for that era of drive, soon moving up to 8MB, but
the performance difference is far less than that from moving
to a newer, larger drive... but we dont' know what drive
capacity your system will support as you didn't mention the
system/motherboard, and it might help to provide detail of
what bios version it uses, as HDD capacity support was often
increased with later board bios until boards started
supporting ATA133.
I suggest a new model, and if the capacity exceeds what the
board can support, only using what capacity the board can
support. If you keep a lookout for deals you might find
something like a 120-160GB drive for about $30-40 after a
rebate.
A few old used drive (even moreso from ebay) is quite a
risk, it might be almost dead already, might have bad
sectors, might even be dead already or in an unknown state.
Are you in the US?
Office Depot has a 160GB Western Digital for $50 after
rebates this week, there may be others cheaper, I haven't
kept track of current HDD deals on smaller drives. Check
your local newspaper sales circulars.
There are also some new drives from Newegg et al., whatever
you feel is the best price
erformance/capacity ratio,
keeping in mind that practically all HDD manufacturers are
using platters worth at least 160GB now, so anything below
80GB (using 1/2 one platter) will be slower... but maybe on
that 600MHz system the bottleneck isn't just the drive so
$10-20 saved might be worthwhile.
http://www.newegg.com/Product/ProductList.asp?Submit=ENE&SubCategory=...
I just wouldn't buy an old drive, only new stock 40GB or
larger, unless you had a local mom-n-pop computer shop that
guaranteed the fitness of the drive but sold it for dirt
cheap (maybe $10 or less total).