basic function of hard disk drive
Tài liệu Tổng quan về Ổ cứng Hard Disk Drive (HDD) doc
Ngày tải lên :
13/12/2013, 04:15
... 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...
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Tài liệu Hard Disk Drive Servo Systems- P1 docx
Ngày tải lên :
14/12/2013, 19:15
... 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...
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Tài liệu Hard Disk Drive Servo Systems- P2 docx
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...
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Tài liệu Hard Disk Drive Servo Systems- P3 ppt
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...
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Tài liệu Hard Disk Drive Servo Systems- P4 ppt
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...
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Tài liệu Hard Disk Drive Servo Systems- P5 pdf
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...
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Tài liệu Hard Disk Drive Servo Systems- P6 pdf
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...
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Tài liệu Hard Disk Drive Servo Systems- P7 pptx
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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An introduction to disk drive modeling
Ngày tải lên :
12/09/2012, 14:16
... 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...
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Metaphor, based on the association of similarity, is one of the two basic types of semantic transference that have been an interest for many linguistic researchers
Ngày tải lên :
07/11/2012, 14:44
... 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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