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SATA3為什麼會比較快?

KiKiUnicorn

4727分

11樓

KiKiUnicorn

個人積分：4727分

文章編號：17993415

facebook wrote:
3Gb=1024*3/8=384MB..

SATA2的傳輸速度理論值是每秒384MB....也就是所謂的3Gb/S

你的算法錯了...

SATA2的頻寬是3Gbit/s，
但他每傳送1Byte中，是由8bit資料+2bit校正碼組成，
所以實際資料傳送速率約為300MB/s

SATA=1.5Gbit/s頻寬=150MB/s實際資料傳送速率+1M連接線
SATA2=3Gbit/s頻寬=300MB/s實際資料傳送速率+支援真正的SATA指令排序（NCQ)+2M連接線
SATA3=6Gbit/s頻寬=600MB/s實際資料傳送速率

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河魨

458分

12樓

河魨

個人積分：458分

文章編號：17993617

Q15: What’s the real-world data transfer rate of SATA 6Gb/s?
A15: The realizable transfer rate across a 6Gb/s SATA link depends on the efficiency of the
controller design on both the host and device sides of the interconnect. The SATA 6Gb/s
interface transmits information at 600MB/s, however not all 600MB/s are realized as the user
data payload because the protocol includes other data and handshaking communications
between the host and device. In general, the SATA interface is very efficient. Realized transfer
rates are typically very close to the theoretical maximum, which is one of the primary benefits of
SATA technology for mass storage devices.
以上取自sataorg的FAQ，也可以去看SATA-IO Overview Brochure

給我的感覺SATA Revision 3.0或稱SATA 6Gb/s 應該是10bit的
另可見sataorg連結出去的http://www.hardocp.com/article/2010/02/20/sata_6gbs_on_your_new_motherboard
一開頭介紹的(1Gigabit per second = 100 Megabytes per second)也就是理論值
SATA Rev.1 1.5G=150MB/s
SATA Rev.2 3.0G=300MB/s
SATA Rev.3 6.0G=600MB/s

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