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What type of HD do I need for my Dell D420?

I have a Dell D420 that I'm looking to increase the speed by adding a static drive.  I know the machine has an odd drive but I'm not sure which type it has and/or which type of SSD I need.

I've checked NewEgg Optionsbut again I don't know which type to choose.  Thanks in advance.

OS choice will be Ubuntu 10.10
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jamietoner
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Any 2.5" sata drive will work, but will be limited to sata 1 speeds.
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The d420 doesn't accept a 2.5 drive. It's something special.
Sorry, its a 1.8" drive with a special zif connector. Heres a link to the teardown. support.dell.com/support/edocs/systems/latd420/en/SM_EN/hddrive.htm#wp1127656
If I rember right it just uses a sata to zif adapter, but I won't be able to find out more till I get home in the morning.
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Thank you. I'll pull it apart and repost. I knew it was something odd but didn't know which drive.
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Thank you.  I found the one below but the read write is nothing like what I expected.  The reason I'm looking to replace this is that I want to speed the machine up.  I'm looking for the same type of performance increase I received when replacing my current SATA with an OCZ SSD.  Any estimates on what type of performance increase I'd get?

http://www.memorysuppliers.com/supertalent-ssd-fzm64gf18h.html
Unfortunately you are going to be limited by the bus speed. I found one thats a bit faster(and only $10 more) but it's as fast as its going to get with an ide interface. Loading apps and booting will be faster but with IDE you won't get near the transfer rates due to bus limitations. Thew OCZ Vertex 2 drive I have in my desktop benches @ 250MB/s which is almost the theoretical limit of sata 2, the ide bus in the D420 has a theoretical limit of either 100MB/s or 133MB/s.
http://www.memorysuppliers.com/supertalent-ssd-fzm64gw18p.html
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I'm using that same drive. It's a recent upgrade and my reason for wanting to upgrade the laptop. I like it's size but not it's speed. If I can get things to run twice or three times a fast I'll be happy.
The drive I posted will easily be 3x faster than the 4200rpm drive its replacing.
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Awesome. Thank you.