I was not aware there was an issue taking ATA66 drives in a Pismo. Even the Wallstreets could take them. You can drop an ATA100 drive in it, because the machine will read it as an ATA66, so there are no worries.
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MacBook 2GHz Intel Core 2 Duo w/ 2GB DDR2 RAM & 120GB SATA 5400RPM HDD
Canon Rebel XTI
Google Cr-48 Beta Laptop