a hard or floppy disk drive functions most like a

... 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...

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....

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...

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...

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...

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...

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...

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...

Ngày tải lên: 14/12/2013, 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...

Ngày tải lên: 22/12/2013, 19:15

... 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...

Ngày tải lên: 26/12/2013, 01:16

... 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...

Ngày tải lên: 27/01/2014, 05:20

Ngày tải lên: 29/03/2014, 20:20

... 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 ... 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...

Ngày tải lên: 23/08/2012, 09:43

... 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...

Ngày tải lên: 12/09/2012, 14:16

Ngày tải lên: 25/10/2013, 21:20

... 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...

Ngày tải lên: 21/12/2013, 19:15

Ngày tải lên: 05/03/2014, 16:20