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Storage Industry Overview
Support outer
equipment
No Under preparation
Support ATAPI
Yes Yes
(schedule is slower)
Support PIO and DMA
mode
Yes Yes
Support CRC
Data CRC check only CRC check for Command & Data
Support hot-Swap
No Yes
Transmission rate
133MB/s 150MB/s (first generation)
Cable connector
40-pin 7-pin
Power supply
connector
Traditional 4-pin power
supply connector
Smaller (but both will be provided in the
first step)
Connector size
Large (6 x 0.9cm) Small (1.7x0.5cm)
Cable length
45cm 1m
Effective signal
number
29-pin 4-pin
Signal voltage
3v, 5v tolerance
(single end)
0.25v +/- 0.25v
(differential)
Power saving
- More power-saving on the signal
transmission and more power supply
management modes are provided.
First party DMA
No Yes
3.1.3 RAID HBA, Host-Based Adapter
RAID technology is the core of storage device, its main role is to act as a bridge
between hard disc (data storage media) and the system host, its function is to manage
all the storage space within the hard disc, to manage the execution of reading and
writing, the optimum allocation of data, the enhancement of data I/O performance, and
the most importantly, protect all the data within the hard disc and provide a backup
mechanism of online backup so that a mission of non-stop operation can be achieved.
RAID HBA is an adapter controller inserted on the mother board, usually, there are
many interface ports (2 ports~12 ports) on the HBA to connect several hard discs, it
can be connected directly and internally to hard disc (mainly based on ATA, Serial ATA
or SCSI) or connected externally to outer equipments (it is normally based on SCSI
interface, but some suppliers plan to turn Serial ATA into externally connected
interface).
RAID HBA is usually used in large host or high level server in the past, and all are SCSI
interface, high cost is a natural thing. However, since PROMISE Technology Inc.
introduced RAID into the IDE/ATA market in 1997, RAID has become widely accepted
in the medium and small sized enterprise server environment and PC system. As
compared to traditional SCSI RAID, Serial ATA/ATA along with its cost superiority
(about 1/2 to 1/3 of SCSI RAID), is seen as one with future high growth in the industry.
Current RAID HBA can be divided into different interfaces such as: SCSI, ATA, Serial
ATA, FC.
PROMISE Technology Inc. is the leading supplier in ATA RAID HBA and Adaptec is
p12
PROMISE Technology, Inc. All rights reserved.
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