2
7
SATA&PATA 传输协议比较
n PATA同一时刻传输的数据位为16位。其
数据的传输速率为传输的数据位与传输
频率之积。
n SATA同一时刻传输的数据位为1位。它
将PATA的传输数据位进行次序调整，形
成串的结构、依次传输。
8
SATA&PATA 数据安全性比较
9
SATA&PATA 数据安全性比较
n PATA－只对16位数据块进行CRC校验，
对当前读写命令以及状态并没有保护。
n SATA－对数据块、命令、状态等32位传
输位都进行CRC校验保护，从而保证了数
据的安全可靠。
10
SATA&PATA总结
11
Serial ATA Opportunities
n The opportunity for serial ATA includes all ATA attached devices(not just
HDDs),and potentially the displacement of other interfaces. The key to rapid
adoption is widespread industry support. The introduction of Serial ATA
support in Intel chipsets is the most significant step toward the industry
adoption of Serial ATA HDDs.At the initial stage, Serial ATA HDDswill be
best suited for the high-end desktop PC market. Ultimately Serial ATA should
capture the entire parallel ATA market. This will require costs dropping
enough to replace parallel ATA in non-HDD applications,such as DVD drives
that don’t require the interface performance.
n In addition, Serial ATAHDDs could encroach on markets currently occupied
by parallel SCSI. For example, the single user low-end workstation market
may findSerialATA very attractive. Parallel ATA is already entering this
market, although Gartner estimates the market share in 2001 was just under
5%. This market includes low-end workstation, server and NAS.
12
Serial ATA Opportunities
n The Serial ATA interface is an important technology upgrade to the parallel
ATA
n interface. Serial ATA advantages include the following:
n ? Point to point connection, eliminating Master/Slave configurations
n ? Thinner and longer cables
n ? No new software driver is necessary for Serial ATA HDDs
n ? Low differential voltage for signals
n ? Interface bandwidth starting with 150 Mbytes/sec, then 300 Mbytes/sec
and
n 600 Mbytes/sec; a robust migration path for the future
n ? Better connector design, for hot-plug, blind mate applications
n ? 32 bits CRC error checking on all data and control information
