ATA/33 has 40 wires. Where as the ATA/66 has 80 wires. Physically they look the same. The extra wires are for grounding.
Pretty sure it was ATA 66. Floppy drives were on the 33 format, that that's not an 80-pin cable.
ATA/ATAPI -4, ATA/ATAPI -5, ATA/ATAPI -6, ATA/ATAPI -7 (SATA)
IDE drives commonly use the ATA standard. ATA usually runs at ATA-33, ATA-66, ATA-100, and ATA-133. These run at 33 MB/s, 66 MB/s, 100 MB/s, and 133 MB/s respectively. Most modern IDE hard drives run at ATA-100 or ATA-133 while older If you have your hard drive on a 40-wire PATA cable and/or the PATA cable attached to your hard drive is also attached to your CD-ROM drive, your hard drive might be forced to run at ATA-33. For best performance, only use an 80-wire PATA cable and do not connect your optical drive with it.
33 MBps
33+33 = 66
33 is 66% of what= 33 / 66= 33 / 0.66= 50
33+33=66 33 +33 66
33% of 200 is 66.
The GCF of 33 and 66 = 33
33
80
6.6 = 66/10 = 33/56.6 = 66/10 = 33/56.6 = 66/10 = 33/56.6 = 66/10 = 33/5