SATA, PATA and all that mess
Having seen all the confusion about SATA, PATA, ATA-6 etc... here is a bit of educational info:
ATA stands for Advanced Technology Attachment aka IDE and EIDE in some ambients. Their interface is the widely known 40 pines connector that has been around for ages.
Through the times there has been several version conventionally named ATA-1 to ATA-8 being:
ATA-4 --> ATA/33
ATA-5 --> ATA/66
ATA-6 --> ATA/100
ATA-7 --> ATA/133
When Serial ATA came out all those "old" ATAs has been renamed as Parallel ATA aka PATA therefore you may now see in someplaces PATA/33, PATA/66 and so forth...
SATA connectors are totally different both in size and shape from PATA
SATA already comes in different versions as SATA/150, SATA/300 (internal drives usually) and eSATA (external drives)
To end this issue for the record:
Some disks found online (ebay) are labeled ATA-6 which are not compatible with MacBook
MacBook uses SATA disks and their thickness have to be a maximum of 9.5 mm, therefore not "all" SATA disks for notebooks around on the market can be used, so when you buy one check very carefully the dimension specifications more than anything else.
Stock disks inside the MacBook are 5400rpm, but on the market you can find 7200rpm too (so far I seen only up to 100Gb, I guess the increase of speed have some limitation due the increase heating too).
Hope this help clarify all the confusion for some people that plan to upgrade their disk.
Fro more technical info go to Wikipedia:
http://en.wikipedia.org/wiki/Advanced_Technology_Attachment
http://en.wikipedia.org/wiki/Serial_ATA
Have fun...
