ATA/100 and ATA/133 are (Parallel) ATA drives and are connected with a 40 (or 80) ribbon cable.
SATA/150 (or Serial ATA) is connected with a small cable.
On the newer SATA drives even the power connector is not the same anymore.
So if you want to use SATA drives on older hardware you ned an extra controller.
But mostlikely you don't get any more speed with it.
Since the disks transfer most of the time no more then 100 Mbit.
So there is almost no speed difference between a ATA/100 , ATA/133 or SATA/150.
Unless you have a special drive with high speed heads.
If you want a faster transfert with normal disks , you also connect them in a raid configuration.
Here you can use Raid 0 (all data is splitted over 2 disks) or Raid 0 + 1.
With Raid 0+1 you have only half of the capacity of both disks.
(2 disks of 200GB results in a fast 200 GB drive) , with Raid 0+1 you have also a more secure drive , the data is tha same on both disks, so if 1 fails you can replace the disk without losing any data.
For using RAID configuration you have to have a special mainboard or a RAID controller.
For a new drive I buy a SATA drive (if the motherboard supports it).
The price is almost the same and the cables are smaller and easier to connect.
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