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Transfer Rates of Various PC InterfacesCompare the transfer/BUS rates of different interfaces to help you select the best device. Please note the actual speed of a device depends on the interface transfer rate, the access rate of that device, and the work load on that device. For instance, a dot-matrix printer will always be slower than a laser printer even though you put the dot-matrix printer on a faster USB port.
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Floppy drive, standard High-Density 1.44MB
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0.062MB/sec
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Superdisk 120MB |
0.565 MB/sec
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Serial ports (COM) |
up to 0.1MB/sec
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Parallel ports (printer), ISA |
2.5MB/sec
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Parallel ports (printer) (IEEE 1284), PCI |
6MB/sec
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USB ports |
12MB/sec
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Firewire IEEE-1394, supporting 63 devices |
up to 400MB/sec
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ATA/IDE |
3.3MB/sec
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Fast ATA/EIDE |
4-16.6MB/sec
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ATA2 |
16.6MB/sec
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Ultra DMA ATA/33 hard disk drive |
33MB/sec
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Ultra DMA ATA/66 hard disk drive |
66MB/sec
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Ultra DMA ATA/100 hard disk drive |
100MB/sec
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Token Ring (IBM, old) |
4 or 16 MB/sec
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SCSI-1 - The original SCSI specification. It utilizes an 8-bit and can support up to 8 agents/peripherals. |
5MB/sec
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SCSI-2 Fast - An ANSI standard with an 8-bit bus and 50-pin SCSI connectors. |
10MB/sec
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SCSI-2 Fast and Wide - Also known as Quad SCSI; this ANSI standard utilizes a 16-bit bus and can support up to 16 agents/peripherals on a SCSI bus. |
20MB/sec
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SCSI Ultra - An ANSI standard which utilizes an 8-bit bus and can support up to 8 agents/peripherals. |
20 MB/sec
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SCSI Ultra Wide - An ANSI standard which utilizes a 16-bit and can support up to 8 agents/peripherals. |
40MB/sec
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SCSI Ultra2 - An ANSI standard which utilizes an 8-bit bus and can support up to 8 agents/peripherals. |
40 MB/sec
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SCSI Ultra2 Wide - An ANSI standard which utilizes a 16-bit and can support up to 16 agents/peripherals. |
80MB/sec
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