Vaio 20GB vs 40GB ?!

[emqvaio]

Besides weight, dimension, disk size and price, is there any other differences between 20GB and 40GB ?!
Does both have the same battery playback time ?

[Vas]

Yes they both have 20Hours Battery hours.
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Vas

[emqvaio]

And do you know if the hard-disks have the same caractheristics (rpm, seek time, data buffer) ?

[Sh1nt4]

uhm rpm, buffer and so on should be the same, the only different thing is the capacity i think

[nemo66]

The 40 Gig is a little bit faster than the 20 because it has more heads (2 more).

[emqvaio]

The 40 Gig is a little bit faster than the 20 because it has more heads (2 more).

And do you think that it could use more battery for that effect ?

Thanks for any info.
I have the 20GB and I really dont need the 40GB, but I can still exchange it if the difference between units is advisable for other technical reasons.
Thanks again.

[diverse]

The 40gb unit does not fit PDAIR's very nice leather case!

[ivan-d]

i think the battery in the 40gb is a bit stronger so that the battery life is left the same...

[nemo66]

Yes, u are right! (it is stronger)

[emqvaio]

So in your opinion if one does not need the extra space of the 40GB, there is no other (technical) reason to exchange my 20GB for the 40GB, right ?
Thanks for any help.