fix a hard drive crash

... 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 ... 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 ... replaced and restored. From: Sam Espana I have used several ways to solve the same issue. The reason is the fact that a hard drive is a hard drive is a hard drive, or is it? The answer is...

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... 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) ... algebraic Riccati equation CNF composite nonlinear feedback DSA digital signal analyzer DSP digital signal processor GB gigabytes HDD hard disk drive LDV laser Doppler vibrometer LQG linear quadratic ... medium are written with data that are ar- ranged in concentric circles or tracks. Data are read or written with a read/write (R/W) head, which consists of a small horseshoe-shaped electromagnet....

Ngày tải lên: 14/12/2013, 19:15

... reference and the given system in Equation 3.189, we again assume that all the state variables of the given system are mea- surable and follow the procedures of the state feedback case to define an auxil- iary ... 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. ... construct a state feedback gain matrix . We have the following result. Theorem 3.17. Consider the system given in Equation 3.48 with and , i.e. all states are measurable. Assume that P has no invariant...

Ngày tải lên: 14/12/2013, 19:15

... 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 ... by introducing an additional integration action in the design. The new approach retains the fast rise time property of the original CNF control and at the same time has an additional capacity of eliminating ... eigenvalues, which implies that is a relatively small scalar. The remaining closed-loop poles of are placed to have a dominating pair with a small damping ratio, which in turn would yield a fast...

Ngày tải lên: 14/12/2013, 19:15

... 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 actuator. ... 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 is ... too many read or write errors, making the disk drive unusable. A suitable measure is the standard deviation of the readings, . A useful guideline is to make the value less than of the track pitch,...

Ngày tải lên: 14/12/2013, 19:15

... e.g., Crandall [203] and Lyon [204]) and (iii) the stochastic lin- earization approach. All of them have certain advantages and limitations. However, the stochastic linearization technique has the ... 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 density function exp where is the normalized covariance of and ... is that the application of an electric field can cause mechanical stress/strain in the piezo materials. There are numerous piezoelectric materials available today, including PZT (lead zirconate...

Ngày tải lên: 14/12/2013, 19:15

... 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, PA; ... 35:2271–3. 165. Suthasun T, Mareels I, Mamun AA. System identification and control design for dual actuated disk drive. Contr Eng Prac 2002; 12:665–76. 166. Takaishi K, Imamura T, Mizasgita Y, Hasegawa S, Ueno ... Automat Contr 1989; 34:831–47. 92. Chen BM, Saberi A, Sannuti P, Shamash Y. Construction and parameterization of all static and dynamic -optimal state feedback solutions, optimal fixed modes and...

Ngày tải lên: 14/12/2013, 19:15