Operating Systems Principles of 1/0 Hardware Device Data rate Some typical Keyboard I 10 bytes/sec M 100 bytes/sec device network 56K modem 7 KB/sec and data base Telephone channel 8 KB/sec Dual ISDN lines 16 KB/sec rates Laser printer 100 KB/sec Scanner 400 KB/sec Classic Ethernet 1.25 MB/sec USB(Universal Serial Bus) 1.5 MB/sec Digital camcorder 4 MB/sec IDE disk 5 MB/sec 40X CD-ROM 6 MB/sec Fast Ethernet 12.5 MB/sec ISA bus 16.7 MB/sec EIDE(ATA-2)disk 16.7 MB/sec FireWire(IEEE 1394)50 MB/sec XGA Monitor 60 MB/sec SONET OC-12 network 78 MB/sec SCSI Ultra 2 disk 80 MB/sec Gigabit Ethernet 125 MB/sec Ultrium tape 320 MB/sec PCI bus 528 MB/s sec Sun Gigaplane XB backplane 20 GB/sec ao Haichang, software school, xidian UniverslOperating Systems Gao Haichang , Software School, Xidian University 6 Principles of I/O Hardware Some typical device, network, and data base rates