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drive is easy to find, we will just rip out all the hard drive s guts and make a simple circuit that whacks the arm against the stopper just like it did when it failed Because of the extreme realism of the failure sound, this prank is perfect for the computer lab, and will always fool anyone who has heard this doom sound before, especially if they lost data due to inadequate backups You do remember to backup your data regularly, don t you Anyhow, find a hard drive, any hard drive, dead or alive, and rip the cover off This may seem easy at first but, because many hard drive manufacturers compete with each other to see who can invent the weirdest and most annoying screw head, you may need to resort to using pliers to get those oddball bolts to loosen up As shown in Figure 4-21, I forced the top cover bolts loose by gripping them with pliers so I can finish taking them out with a screwdriver that somewhat fits into the star-shaped head Use any means necessary to get those bolts to loosen up, including vice grips or side cutters if you have to Oh, and yes, this certainly voids the drive s warranty Once you manage to get the top cover free (don t forget about the bolts hidden under the sticker), you will see the innards of a once-working

Figure 15-18

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hard disk drive as shown in Figure 4-22 At the top left there is a pair of magnets that create a strong magnetic field for the electromagnetic voice coil, which is placed between them This voice coil is mounted on the end of the arm that carries the drive s read/write heads from one side of the platter(s) to the other, much like an old record player operates Yes, I used to have vinyl records When a drive fails, often this arm is moved back and forth several times across the entire radius of the disk platter in a futile attempt to read some data Of course, owing to the nature of the failure (often in the read/write heads), no data are ever found, and the arm clunks off the small stopper, which prevents the heads from traveling too far off the disk platter It is this clunking sound that we want to recreate, so the easiest way to do so will be to use the actual drive mechanics The only parts of the drive we will be using are the voice coil and read/write head arm, so you can keep removing those annoying bolts until that is all that remains Remove the controller board from the underside of the drive, and then remove the motor and platters by taking out the five or six bolts that hold the plates and platter to the motor spindle (more annoying bolt heads) When you are done, there will be plenty of room left inside the drive

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When you add the GridView control, a GridView Tasks pane displays, as shown in Figure 15-19 You may accept the default values in this pane However, using the Properties window, rename the GridView control (using its ID property) dgvData to keep its name consistent with the DataGridView control in the Windows application, because we are attempting to port the code from the Windows application to this web application

casing for your battery and circuit board for a nice compact unit Do not remove the little board that attaches the thin ribbon cable connected to the arm to the base of the drive casing, as we will need to solder a pair of wires to the end of that cable, where the controller board once sent power to the voice coil Since the voice coil is allowed to travel freely between the two magnets, applying power to the coil will send the arm all the way to one side, causing it to bang off the stopper, making the desired noise we are after Figure 4-23 shows what is left after all the unnecessary parts have been removed from the hard disk The only hard part in making this project work is finding the two points that need to be connected

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