Choosing hard drives... 320 gb internal, ultrabay adapter, or 1tb external?

Hello I'm between that options, my questions are about performance. I have a t61p 6460 d8g. that comes with Hitachi 160 gb sata 1 7200 RPM.
1-The Seagate Momentus 7200.3 SATA 3Gb/s 320-GB Hard Drive may improve the laptop performance, it can be faster plus having more storage?
2-I read both 40Y8725 ultrabay adaptor works and doesn't fit in the t61p, who can confirm that? I already have two external hdd 160 and 80 gb... can be nice to use them in the ultrabay.
3-may be is better to keep my hdd and get an external
Barracuda ES.2 SATA 3.0-Gb/s 1-TB Hard Drive but I guess even if the drive is faster the real speed will be slower because it is external
cheers
Just for curiosity... including vista, how much storage do you use for the program files? I have like 80 gb just for the programs is that too much?
Message Edited by Pedrogaris on 10-21-2008 12:54 PM
Message Edited by Pedrogaris on 10-21-2008 12:55 PM
Solved!
Go to Solution.

I think that import the adapter would be more expensive than getting a 320 gb, considering that the adapter is going to be in a slower interface.
At other side it can be great to have 2nd hdd so may it can startup with another OS.
And about the hdd performance, there's some points a don't get, here are the datasheets
http://www.seagate.com/docs/pdf/datasheet/disc/ds_momentus_7200_3.pdf
http://www.hitachigst.com/tech/techlib.nsf/techdocs/A198FEF5A3B22F08862572D400656432/$file/7K200DS.p...
I guess the many / in the measures correspond to the different models in the Hitachi my one should be the second model.
The data transfer info is given in a different way I don't know how I should compare them...
And the reading time that is 10 ms in the Hitachi I found another place that says that is 11 ms for the Seagate.

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Choosing hard drives... 320 gb internal, ultrabay adapter, or 1tb external?

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