basic function of hard disk drive

... từ) với máy tính. EIDE là một bước phát triển Tổng quan về Ổ cứng - Hard Disk Drive (HDD) Welcome to my “Just about Hard Disk Drive Tutorial ! Tôi đã tốn khá nhiều thời gian cho việc chỉnh sửa ... tôi chỉ lấy duy nhất chuẩn ổ cứng IDE (Intergrate Drive Electronics) để phân tích và minh họa. A. Cấu trúc vật lý của ổ cứng: Ổ cứng (Harddisk driver) là một kiểu thiết bị lưu trữ dữ liệu (storage device). ... là Ontrack’s Disk Manager hoặc là Micro House’s EZ -Drive, bởi vì có rất nhiều máy vi tính không có BIOS hoặc controller hỗ trợ những ổ cứng IDE dung lượng lớn. -Extended Intergrated Drive Electronics...

Ngày tải lên: 13/12/2013, 04:15

... minimization of this loss function, i.e. (2.25) 2. D ETERMINATION OF M ODEL O RDER . The loss function can also be used to determine the order of a system. If the order of a model is lower than that of ... value of the loss function will decrease significantly with the increase of the order of the model. However, when the order of the model is higher than that of the system, the increase of model ... Industrial Control Series Editors Professor Michael J. Grimble, Professor of Industrial Systems and Director Professor Michael A. Johnson, Professor (Emeritus) of Control Systems and Deputy Director Industrial...

Ngày tải lên: 14/12/2013, 19:15

... is of continuous-time, if is of discrete-time. 2. spans if is of continuous-time, if is of discrete-time. 3. spans . 4. spans if is of continuous-time, if is of discrete-time. 5. spans if is of ... of linear systems, namely the special coordinate basis of [72, 73], which has a unique feature of displaying the structural properties of linear systems. The detailed deriva- tion and proof of ... structural form of Theorem 3.1 and in a small variation of the compact form of Equations 3.20 to 3.23. It can be shown that the compact form of Equations 3.20 to 3.23 for the subsystem from to of Equation...

Ngày tải lên: 14/12/2013, 19:15

... proved that the increase of the Lyapunov function P and R are negative-definite when they are effective, respectively. The last item is always negative in view of the definition of in Equation 4.109. ... initial state of the given system , the initial state of the controller , and step command input that satisfy Equation 5.40, and (5.73) and hence (5.74) This completes the proof of Theorem 5.6. iii. ... where is the size of the linear region of the PTOS control law. The Lyapunov function for the overall closed-loop system can be chosen as P R (4.63) where is the unit step function. It is simple...

Ngày tải lên: 14/12/2013, 19:15

... output of the closed-loop system enters the neighborhood of of the target reference. Alternatively, one can define such a neighborhood in terms of the percentage of final target instead of the ... track asymptotically the step command input of amplitude from an initial state , provided that , and satisfy R R and (5.192) Proof. Again, the proof of this theorem is similar to those given earlier. 5.3.2 ... the poles of are in the desired locations, e.g., the dominated poles have a large damping ratio, which would reduce the overshoot of the output response. Note that the choice of is nonunique. Any function...

Ngày tải lên: 14/12/2013, 19:15

... know that the runouts in real disk drives are composed mainly of RROs, which are basically sinusoidal with a frequency of about 55 Hz, equivalent to the spin rate of the spindle motor. By manually ... are above the tolerance of the disk drive would result in too many read or write errors, making the disk drive unusable. A suitable measure is the standard deviation of the readings, . A useful ... example, [141]). In disk drive applications, the variation in the position of the R/W head from the center of the track during track following, which can be directly read off as the PES, is very...

Ngày tải lên: 14/12/2013, 19:15

... 266 9 Modeling and Design of a Microdrive System 10 0 10 1 10 2 10 3 10 4 10 5 −120 −100 −80 −60 −40 −20 0 Frequency (Hz) Magnitude (dB) T function (max. 4.4 dB) S function (max. 4.1 dB) (a) ... system of Equation 10.22, (10.31) where (10.32) such that the transformed measurement matrix has the form of (10.33) Clearly, the first three states of the transformed system, or , and of the ... reference 10 2 10 3 10 4 10 5 10 6 −90 −80 −70 −60 −50 −40 −30 −20 −10 0 10 Frequency (rad/s) Magnitude (dB) Sensitivity function Complementary sensitivity function Figure 10.14. Sensitivity and complementary sensitivity functions of overall control system Please purchase...

Ngày tải lên: 14/12/2013, 19:15

... to hard disk drive servo system. Proc 6th Int Workshop Adv Motion Contr; Nagoya, Japan; 2000. p. 246–51. 5. Hara S, Hara T, Yi L, Tomizuka M. Two degree -of- freedom controllers for hard disk drives ... model of a Maxtor (Model 51536U3) hard drive VCM actuator can be depicted as in Figure 11.1: Nominal plant Resonance modes Noise Figure 11.1. Block diagram of the dynamical model of the hard drive ... from disk to disk in a batch of million drives. Note that many new hard drives in the market nowadays might have resonance modes at much higher frequencies (such as those for the IBM microdrives...

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... model. Characteristics of modern disk drives To model disk drives, we must understand how they behave. Thus, we begin with an overview of the current state of the art in nonremovable magnetic disk drives with ... 2. Caching of requests. The functions of the speed-matching buffer in the disk drive can be readily extended to include some form of caching for both reads and writes. Caches in disk drives tend ... drive. Related work. Disk drive models have been used ever since disk drives became available as storage devices. Because of their nonlinear, state-dependent behavior, disk drives cannot be modeled...

Ngày tải lên: 12/09/2012, 14:16

... metafunction, an analysis of a clause gives a different kind of structure composed from a different set of elements. For example, in the ideational metafunction, a clause is analyzed into the functional ... alternative ways of construing reality, and interpersonal metaphor, which offer alternative possibilities of expressing modal meanings (metaphors of modality), or exchanging commands (metaphors of mood). ... description of emotion in poetic discourse 8 7 Summary In this paper, we have considered the notion of grammatical metaphor, as it is conceived of in the systemic functional model of language...

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