浅谈现在的SSD与传统机械盘(国外英文资料).doc

浅谈现在的SSD与传统机械盘(国外英文资料) From 7200 hard drive upgrade to 10000 turn of the dragon, which is called quantitative change. From 10000 RPM Raptor upgrade to SSD, this is called qualitative change. The gap between the 2 is somewhat large, while others are very close, mainly difficult to compare. Often heard people say: I bought 2 black disk group RAID 0, transmission rate is close to 250MB/s, and this speed and Intel X25-M match, write high, capacity is big, the cost performance is obviously good.. In the beginning, he tried to correct his mistaken idea and then became numb. But what is not said, sometimes he may not understand, he is a businessman, or just bought the black disc users, or just want to speculation, the world, what people will have. Theres not much nonsense. Let me talk about my feelings. I used the 7200 wheel mechanical disk, group RAID 0. I have used 10000 to the Raptor, group RAID 0, I also used SAS 15000 to 3.5inch and 2.5inch, group RAID 0 disc, with early MLC, SLC group, RAID 0, is now in use MLC SandForce and barefoot SSD. As a user, I feel I still have some say. First of all, the first mechanical disk operation, when the disk in the spindle motor drive, high speed rotating head, arm in the voice coil motor under the control of radial movement and addressing over the disk, there are several common mechanical indexes: 1, the speed per minute: refers to the spindle motor drives the disk speed, generally 7200~15000 turn, energy-saving disk is 5400 turn. (everybody knows) 2, average seek time: generally refers to the search time, the unit is Ms. This means that after the disk is read / written, the head is moved to the specified track (which should be cylindrical objectively, but the time required for the relative head) is the track. In fact, in addition to the average seek time, and the road between seek time and total seek time, the former refers to the head from the current track track to move to the next time, the latter refers to the head from the ou