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The original Zip drive had a data transfer rate of about 1 megabyte/second and a seek time of 28 milliseconds on average, compared to a standard 1.44 MB floppy's 500 kbit/s (62.5 kB/s) transfer rate and several-hundred millisecond average seek time. This resulted in a disk that has all of the 9 cm (3½") floppy's convenience, but holds much more data, with performance that is much quicker than a standard floppy drive (though not directly competitive with hard drives). The Zip disk uses smaller media (about the size of a 9 cm (3½") microfloppy, rather than the Compact Disc-sized Bernoulli media), and a simplified drive design that reduced its overall cost. The Zip system is based loosely on Iomega's earlier Bernoulli Box system in both systems, a set of read/write heads mounted on a linear actuator flies over a rapidly spinning floppy disk mounted in a sturdy cartridge. The Zip brand was also used for internal and external CD writers known as Zip-650 or Zip-CD. It has been quickly superseded by flash drive systems as well as rewritable CDs and DVDs, and is practically not in use anymore. The format became the most popular of the super-floppy type products but never reached the status of a quasi-standard to replace the 3.5-inch floppy disk. Originally it had a capacity of 100 MB, but later versions increased this to first 250 MB and then 750 MB. The Zip drive is a medium-capacity removable disk storage system, introduced by Iomega in late 1994.