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This motherboard supports
modes. The IDE bus is 16-bit, which means every transfer is two bytes.
Mode
Clock Period
PIO mode 0
30ns
PIO mode 1
30ns
PIO mode 2
30ns
PIO mode 3
30ns
PIO mode 4
30ns
DMA mode 0
30ns
DMA mode 1
30ns
DMA mode 2
30ns
UDMA/33
30ns
UDMA/66
30ns
UDMA/100
20ns
Tip: To achieve the best performance of Ultra DMA/66 hard disks,
a special 80-wires IDE cable is required..
ATA/66
IDE. Following table lists the transfer rate of IDE PIO and DMA
Clock
Cycle Time
Count
20
600ns
13
383ns
8
240ns
6
180ns
4
120ns
16
480ns
5
150ns
4
120ns
4
120ns
2
60ns
2
40ns
27
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Data Transfer Rate
(1/600ns) x 2byte = 3.3MB/s
(1/383ns) x 2byte = 5.2MB/s
(1/240ns) x 2byte = 8.3MB/s
(1/180ns) x 2byte = 11.1MB/s
(1/120ns) x 2byte = 16.6MB/s
(1/480ns) x 2byte = 4.16MB/s
(1/150ns) x 2byte = 13.3MB/s
(1/120ns) x 2byte = 16.6MB/s
(1/120ns) x 2byte x2 = 33MB/s
(1/60ns) x 2byte x2 = 66MB/s
(1/40ns) x 2byte x2 = 100MB/s
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