What is the speed of data transfers with ATA133 drives?

ATA133 drives, also known as Ultra ATA/133, have a maximum data transfer rate of 133 MB/s (megabytes per second). This speed represents the theoretical limit under optimal conditions, and actual transfer rates may be lower due to factors like system performance, drive fragmentation, and the type of data being transferred. ATA133 is an improvement over its predecessor, ATA100, which had a maximum speed of 100 MB/s.