Iomega Predator in the test: external USB 2.0 burner
As already mentioned, the Iomega burner is connected to the computer via the USB 1.1 or USB 2.0 bus. Like all other burners of the new generation, the Iomega Predator also offers protection against buffer underruns, and this technology is called Maximun Burn Protection at Iomega. Basically, it's nothing different from Asus and Yamaha, just with a different name. As soon as the data stream breaks for whatever reason between the burner and the hard drive, for example, the burn process is stopped for a short time and, as soon as the buffer is filled again, it is continued at exactly the same point. The cache is just as big as in the last test of the Asus CRW3212A burner, namely 2 MB. Without the buffer underrun protection, the buffer would be empty after 0.57 seconds in the event of a disrupted data stream at a burning speed of 24x (3600kb/s), resulting in a buffer underrun and a burned CD. Otherwise, the burner supports the common writing modes, is CloneCD compatible and can also overburn CDs.
If the burner is connected to USB 1.1, it uses the CLV method and writes continuously at four times the speed. If it is connected to USB 2.0, it uses the Zone-CLV writing method like the Asus CRW3212A burner. Like the Asus burner, it starts at 16 times the burning speed and also reaches a full 24 times the speed at the 15th minute of a CD. Compared to the Yamaha 3200E, the Iomega Predator burner should be a bit slower, because the Yamaha burner already starts at 18 times the speed, the Predator uses the Zone-CLV method and thus slightly reduces the speed before each new section before increasing .
When reading data, Iomega such as Yamaha and Asus use the CAV method, unless it is on the The USB 1.1 bus is stuck, because there it also uses the old CLV process at constant speed, just like when burning, since otherwise the bandwidth of the old USB standard with the intended 12MBit/s (1.5 MByte/s) would be completely exhausted. In addition to the pure data stream of 900kb/s at 6 times the speed, numerous checksums also have to travel over the USB cable. In contrast, to be able to reach the limits of USB 2.0 with its 480 Mbit/s, i.e. 60 Mbyte/s, the recorder would have to write at more than 300 times the speed.
On the next page: Test system