In article , lid says...

I am sensing that my HP Pavillion tx1000 notebook's 250GB SATA drive's
days are numbered and I have been trying to find a new one to replace it
with. However, this 5400 RPM Western Digital WD2500BEVS-60UST0 model
doesn't seem to be available at a reasonable price and most that pop up
in Google search are used. So I was wondering if perhaps I could look
for other 2.5" SATA models, maybe with higher capacity and higher speed,
but I am worried what kind of compatibility problems I could face then.
Even if the electrical interface is the same, they might not fit into
the caddy the original drive is in. What about SATA II or SATA III
upgrades? Has any of you done this kind of laptop HD replacement and
could give me some pointers? Thanks.

SSD drives are 2.5" so they'll almost always pop right in as a laptop
replacement drive (assuming it's SATA and not older IDE). If you have an
external enclosure you can temporaily put the SSD in that then there's
choices in the software you can use to clone the existing hard disk onto
the SSD. Once done, shut down, open case, swap old drive out, put SSD
in, reboot and be surprised how much faster it boots.

Might not be best spec drives (and not worst) but least some Kingston
models come with everything you need including the external enclosure,
cloning software etc. What's nice is at end of it the old drive can
become an external backup drive in the provided case. Check everything
ok on the new drive first then can wipe out the old drive once you
attach it as an external.