are you aware that laptop and desktop HDDs are have different size
connectors. Both are IDE (Not to be confused with Floppy which
looks a bit like IDE from the outside, but isn't)
Laptop HDDs are 2.5" IDE and desktop HDDs are 3.5" IDE.
And if you googled to look at devices to let youy do what you want to
do, you'd see what is obvious, which is that you need a 2.5"-3.5"
adaptor
I think these come in either a cable form, or a PCB with 2.5" IDE
connector on one face and the 3.5" connector other on the other face.
USB-IDE adaptor is a good idea, but get e.g. a 2.5"-3.5" cable too
I can't remember how the laptop hdd receives power, something to do
with pins of the laptop ide cable supplying it with power. I think a
2.5-3.5 kit should show a picture or provide all you need to get it
done. THen you just want a USB-IDE adaptor.
Yes a 2.5" gets the power over pins on same connector as
data, typically an adapter has a wired power plug coming off
of it for this.
However, my interpretation of the OP's post was that he had
internal drives, as-in, 3.5", that were to be used with the
laptop.
Unless he's wanting to continually swap cables around and
package and unpackage drives so they're protected in the
interim, which could get a bit tedious over time, he'll
probably want multiple enclosures and a USB hub IF USB is
the route most desired, so the whole lot of drives connects
with a single USB plug into the laptop.
Problem is, the costs start adding up, it could be as cost
effective to just get one new drive and a USB enclosure, or
a ready-made kit with drive and enclosure as one product.
Maybe a pair of them for redundancy if this is a lone,
important data store.
Then again we don't even know if OP has a desktop system...
might be more reasonable to just put as many drives into it
as will fit then network as supported by both systems, OR
again the alternative of just getting one new drive instead
and putting in the desktop system. Nothing was mentioned
about a need for these drives to be portable with the laptop
and we don't even know the capacity required. LOL, for all
we know it might work as well to just buy an 8GB CF card,
they're now down under $100.