a hard or floppy disk drive functions most like a
Tài liệu Tổng quan về Ổ cứng Hard Disk Drive (HDD) doc
Ngày tải lên :
13/12/2013, 04:15
... c a Ultra ATA (Ultra
DMA)
MWord DMA 3/ Ultra ATA 33 33mgbyte/s
Ultra DMA 3 44Mbbyte/s
Ultra DMA 4 / Ultra ATA 66 66Mgbyte/s
Ultra DMA 5 / Ultra ATA 100 100Mgbyte/s
Giới thiệu về Serial ATA:
Serial ... 56098
Những lợi thế c a SerialATA:
Hiệu suất cao hôm nay và tương lai : ngay từ thế hệ đầu tiên
SerialATA đã đạt đến tốc độ 150Mbyte/s so với tốc độ tối a mà
Parallel ATA (giao diện ATA song song) đạt ... ATA là từ viết tắt c a Address
Transfer Area - Định vị vùng truyền dẫn và Ultra DMA – Ultra Direct
Memory Access – Định hướng truy xuất bộ nhớ cao cấp. ATA chậm
hơn rất nhiều so với Ultra ATA....
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Tài liệu Hard Disk Drive Servo Systems- P1 docx
Ngày tải lên :
14/12/2013, 19:15
... has
its own application domain including the use as a microactuator for the dual-stage
actuated hard drives. Finally, we post in Chapter 11 a benchmark design problem for
a typical HDD (Maxtor 51536U3) ... at 70% per
year. At the same time, the speed of the hard disk and its interfaces has also increased
dramatically.
Some of the very earliest computers had no storage at all. Each time a program
had ... Singapore
4 Engineering Drive 3
Singapore 117576
Venkatakrishnan Venkataramanan, PhD
Mechatronics and Recording Channel
Division
Data Storage Institute
DSI Building, 5 Engineering Drive 1
Singapore...
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Tài liệu Hard Disk Drive Servo Systems- P2 docx
Ngày tải lên :
14/12/2013, 19:15
... output through a stack of integrators (or backward-
shifting operators), whereas
is the state associated with those integrators
(or backward-shifting operators) between
and . Moreover, and
, respectively, ... to avoid these kinds of
problem at the initial stage by adding or adjusting sensors or actuators in the system.
Sometimes, a simple rearrangement of existing sensors and /or actuators could totally
change ... define
(3.35)
and
(3.36)
and are associated with the so-called state zero directions of if is
an invariant zero of
.
These subspaces and can also be easily obtained using the special
coordinate basis....
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Tài liệu Hard Disk Drive Servo Systems- P3 ppt
Ngày tải lên :
14/12/2013, 19:15
... control and at the same time has an
additional capacity of eliminating steady-state bias due to disturbances.
Specifically, we consider a linear system with an amplitude constrained actuator,
characterized ... exists a
such that for any
satisfying we have
Q
and hence .
Case 3. Similarly, for the case when
(5.71)
we can show that there exists a
such that for any satisfying
,wehave for all the trajectories ... design of a linear
feedback law with a small closed-loop damping ratio and a nonlinear feedback law
through an appropriate Lyapunov function to cause the closed-loop system to be
highly damped as the...
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Tài liệu Hard Disk Drive Servo Systems- P4 ppt
Ngày tải lên :
14/12/2013, 19:15
... Butterworth pattern with an appropriate
bandwidth. In any case, the corresponding parameters can be further tuned on the
main panel to obtain a satisfactory performance for the overall system.
S
TAGE
4: ... than
that of the TOC in asymptotic tracking situations. It can also be shown that, no matter
how small the target region is, say
for any small , we can always find a
suitable control law that ... situation, in which there is only part of state variables available for feedback.
As usual, for such a situation, one could either design a full-order or a reduced-
order measurement feedback...
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Tài liệu Hard Disk Drive Servo Systems- P5 pdf
Ngày tải lên :
14/12/2013, 19:15
... dual-stage actuator. Since the VCM actu-
ator and the microactuator are decoupled, we need to identify two separate models
for the VCM actuator and for the microactuator. A Maxtor dual-stage HDD ... approaches and the
microactuator is controlled by a proportional gain together with an appropriate filter.
8.2 Modeling of a Dual-stage Actuator
In this section we develop a model for the dual-stage ... this watermark.
218 8 Dual-stage Actuated Servo Systems
PZT
Bearing
Pivot
VCM
Elements
Active
Suspension
Base Plate
Head
Figure 8.1. A dual-stage HDD actuator
servo system performances, but more...
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Tài liệu Hard Disk Drive Servo Systems- P6 pdf
Ngày tải lên :
14/12/2013, 19:15
... 10.1. A scaled-up model of this piezoelectric
actuator, which is targeted for use in the secondary stage of a dual-stage actuator for
magnetic recording, was actually built and modeled by Low and ... system for the pair
, which gives a static
gain of
and a peak frequency of Hz. In order to obtain a more accurate
result, we repeat the above experimental tests for several pairs
and the results
are ... stochastic linearization coefficients
and are determined. It turns
out that if
and are of zero means and jointly Gaussian, then and can be
easily obtained. Let us assume that
and have a joint probability...
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Tài liệu Hard Disk Drive Servo Systems- P7 pptx
Ngày tải lên :
14/12/2013, 19:15
... 346–51.
29. Weerasooriya S, Low TS. Adaptive sliding mode control of a disk drive actuator. Proc
Asia-Pacific Workshop Adv Motion Contr; Singapore, 1993. p. 177–82.
30. Workman ML. Adaptive proximate time ... Wood R.
Analysis of the dynamics of 3.5
hard disk drive actuators. Technical Report. Data
Storage Institute (Singapore); 1997.
36. Chang JK, Weerasooriya S, Ho HT. Improved TMR through a frequency ... for
hard disk drives. Proc American Contr Conf; San Diego, CA; 1999. p. 4116–21.
158. Horsley DA, Hernandez D, Horowitz R, Packard AK, Pisano AP. Closed-loop control of
a microfabricated actuator for...
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Tài liệu Hard Disk Drive Servo Systems- P8 docx
Ngày tải lên :
14/12/2013, 19:15
... 4116–21.
158. Horsley DA, Hernandez D, Horowitz R, Packard AK, Pisano AP. Closed-loop control of
a microfabricated actuator for dual-stage hard disk drive servo systems. Proc American
Contr Conf; Philadelphia, ... Soc
Ann Conf; Aachen, Germany; 1998. p. 1405–10.
157. Hernandez D, Park SS, Horowitz R, Packard A. Dual-stage track-following design for
hard disk drives. Proc American Contr Conf; San Diego, CA; ... microactuator based, two stage servo system. IEEE
Trans Ind Electron 1995; 42:222–33.
149. Aggarwal SK, Horsley DA, Horowitz R, Pisano AP. Microactuators for high density
disk drives. Proc American...
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Tài liệu 200 ways to revive a hard drive pdf
Ngày tải lên :
22/12/2013, 19:15
... the hard drive can be
attached as a "slave" and the important data copied to the "master" bootable drive. Many times that
approach can be used even for hardware-related ...
setup mode as well as setting up disk drives for auto detect, etc. Have an ample supply of blank
formatted diskettes readily available. Make sure you have space available to copy any needed ... suspect drive. Make a boot diskette. FDISK, FORMAT, EDIT, SCANDISK, CD-ROM drivers, and the
hard drive vendors diagnostic programs should all be on the diskette.
200 ways to revive a hard drive...
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Tài liệu 200 ways to revive a hard drive ppt
Ngày tải lên :
26/12/2013, 01:16
... person has
faced or will face at least once: a failed hard drive. In that particular case, a Compaq Prolinea 4/66 user
was getting errors like " ;disk 0 error" and "invalid drive ... 6, I said that if the drive boots you're almost done. What's left? Make that recovery diskette,
make a backup of the drive and thoroughly scan the hard drive for any physical errors. ... drive in another machine.
5. Boot from a floppy attach to a network drive or have a secondary drive installed and if you can access
the data copy it off to there.
6. The drive could have a...
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Tài liệu 200 Ways to revive a hard drive pdf
Ngày tải lên :
27/01/2014, 05:20
... data was backed up to a portable tape drive and the C
drive was replaced and restored.
From: Sam Espana
I have used several ways to solve the same issue. The reason is the fact that a hard ... This may be all that's
needed to restore a drive to a functional state.
ã If after the format there are still problems trash the drive. Don't take any chances with a flaky hard
drive. ... bring a startup disk from a Win98 machine to start with (make sure you have the correct
startup disk type FAT 16 for machines fdisked that way FAT 32 for machines fdisked that way If the
'owner...
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200 ways to revive a hard driver
Ngày tải lên :
23/08/2012, 09:43
... data was backed up to a portable tape drive and the C
drive was replaced and restored.
From: Sam Espana
I have used several ways to solve the same issue. The reason is the fact that a hard ... the data on the drive. If you need the data, then I would send the drive to a data recovery lab
that can extract the data from a dead drive and save the data to a tape, CD, HD, etc. This can be ... ways to revive a hard drive
We based one of our most popular pop quiz challenges on a situation every tech support person has
faced or will face at least once: a failed hard drive. In that...
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An introduction to disk drive modeling
Ngày tải lên :
12/09/2012, 14:16
... others may become particularly important when a workload has large data transfers.
Table 3. Performance figures for the models of three disk drives
show greater accuracy as features are added to ... compounded annually over the last decade. As a result, disk system performance
is fast becoming a dominant factor in overall system behavior.
Naturally, researchers want to improve overall I/O performance, ... of a platter than at the inside. To maximize storage capacity,
linear density should remain near the maximum that the drive can support; thus, the amount of data
stored on each track should scale...
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Tài liệu Lab 5.2.7 Establishing a Console Connection to a Router or Switch docx
Ngày tải lên :
21/12/2013, 19:15
... RJ-45 connector labeled “Console”.
Step 2 Identify the computer serial interface, which is COM 1 or 2
a. It should be a 9 or 25-pin male connector labeled serial or COM1. It may or may not be ... interface
Background / Preparation
This lab will focus on the ability to connect a PC to a router or a switch in order to establish a console
session and observe the user interface. A console ... terminal is a DB-25, an RJ-45 to DB-25 adapter
will be needed. Both of these adapters typically come with a Cisco router or switch.
Step 4 Locate or build a rollover cable
Use a rollover...
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