Thursday, January 22, 2009

Read Write Head Change Tool

In a hard drive, the heads fly above the disk surface with clearance of as little as 3 nanometres. The "flying height" is constantly decreasing to enable higher aerial density. The flying height of the head is controlled by the design of an air-bearing etched onto the disk-facing surface. The role of the airbearing is to maintain the flying height constant as the head moves over the surface of the disk. If the head hits the disk's surface, a catastrophic head crash can result.

The heads themselves started out similar to the heads in tape recorders -- simple devices made out of a tiny U-shaped piece of highly magnetizable material called ferrite wrapped in a fine wire coil. When writing, the coil is energized, a strong magnetic field forms in the gap of the U, and the recording surface adjacent to the gap is magnetized. When reading, the magnetized material rotates past the heads, the ferrite core concentrates the field, and a current is generated in the coil. The gap where the field is very strong is quite narrow. That gap is roughly equal to the thickness of the magnetic media on the recording surface. The gap determines the minimum size of a recorded area on the disk. Ferrite heads are large, and write fairly large features. They must also be flown fairly far from the surface thus requiring stronger fields and larger heads.

Metal in Gap (MIG) heads are ferrite heads with a small piece of metal in the head gap that concentrates the field. This allows smaller features to be read and written. MIG heads were replaced with thin film heads. Thin film heads were electronically similar to ferrite heads and used the same physics. But they were manufactured using photolithographic processes and thin films of material that allowed fine features to be created. Thin film heads were much smaller than MIG heads and therefore allowed smaller recorded features to be used. Thin film heads allowed 3.5 in drives to reach 4GB storage capacities in 1995. The geometry of the head gap was a compromise between what worked best for reading and what worked best for writing.

The next head improvement was to optimize the thin film head for writing and to create a separate head for reading. The separate read head uses the magnetoresistive effect which changes the resistance of a material in the presence of magnetism. These MR heads are able to read very small magnetic features reliably, but can not be used to create the strong field used for writing. The term AMR (A=anisotropic) is sometimes used instead of MR. The introduction of the MR head in 1996 lead to a period of rapid aerial density increases exceeding 100% per year. In 2000 GMR, Giant Magnetoresistive, heads started to replace MR/AMR read heads. In 2005, the first drives to use TMR, tunneling MR, heads were introduced by Seagate allowing 400 GB drives with 3 disk platters.

In 2005, Seagate introduced TMR heads using integrated heaters to control the shape the pole-tip region of the head during operation. The heater is activated prior to the start of a write operation to ensure close proximity the write pole to the media. This improves the written magnetic transitions by saturating the media.

Read Write Head Change tools are the mandatory tools to replace read write heads of damaged hard drives that are unable to detect any data.

To keep the heads from crashing into the platter is just as important to keep them from crashing into each other although they shouldn’t be allowed to touch the platters. This read write head replacement tool that when used in a data recovery process will prevent the read / write heads from making any contact with each other, and /or crashing to the platters of the hard drive. The tool is made up of derlin plastic and finds is use in almost all the process of data recovery.

The heads on each type of drive sit at different heights to fly over the different heights of the platters. The platters vary in height due to the spacers (metallic/plastic) that are used to keep them apart. Read write head tool is fully adjustable for one or more (up to 4) heads at different heights. One tool fits all. This can do multi platter, single platter and dual or two platter hard drives head stack swaps.

The head replacement technology is used where hard drives have been burned and the read write heads are almost burned out completely, flooded drives where the heads have suffered water or corrosive damage. Some hard drives suffer head damage due to the heads knocking against the limiters or if the hard drive has been dropped. The Read Write head tool is a standard tool in order to recover data from above written hard drives. The read write head tool itself is very simple to use and causes no damage to the heads or the platters surface. The tools are available for both desktop and laptop hard drives. To work on both, the products namely read write head replacement tool for desktop and read write head replacement tool for laptop are required. Once they are adjusted to the appropriate heights using the platters as a guide, the heads need to be slided onto the wedges to remove the heads without damage. It is important with any of read write head change tools that they are not inserted between the heads as this would damage the sensors. The tool should be only inserted between the sliders.

On taking a close look at a read / write head it can be seen that there are copper coils belonging to the transducer, and tiny electric wires attached to gold pads. The read write head tool is used to keep the heads from crashing during alignment. If large quantities of these hard drives are available, read write head tools, the plastic wedges in donor drives can be left prior to using these parts if one wanted to prepare ahead.

The tools are available in a very low cost starting from 25 USD.There are total twelve read write head tools available. A separate tool for hard drives with one, two, three or four platters can be purchased. A complete economical kit consisting of all twelve tools is also available. This complete kit is mandatory for those who are into the data recovery process continuously in one or the other hard drives. The tool keeps the heads apart so that one can align the read write heads and make repairs to the hard drive heads. It will work for any hard drive - Seagate, Hitachi, Fujitsu, IBM, Maxtor, Conner, Western Digital, Samsung. Read write head tool allows you to perform your data recovery quickly and safely, saving you time and money. If several of our tools are purchased, you will have enough components to remove as many heads as you want. A single tool will handle 1-6 heads. Two tools can be combined to remove 12 heads not that we see many drives like that in this day and age.

No comments:

Post a Comment