Why does the Western Digital Black Disk repeatedly change the head and knock, why can only read out one face, why the spare parts are restored or not, why can't you see the scratch data and can't read it? For the specific reasons, please check the black number of the Western Digital in this issue. Road, depth reveals those things in the black plate.
1: I remember a few years ago, the typical components, WD800BB WD800JD these disks, basically did not say that data recovery is not good, and the basic data is complete, there will be no bad sectors in the mirroring process, and occasionally encountered may change The last head is knocked on, and then replaced by 2-3. There is definitely one that is compatible. It can be used to copy data, and the head of the 1292 board can be compatible with the heads of 1130 and 1335 boards. This can be complete. The recovery period is concentrated in the period of 2006-2009. Due to the WD800 series, the single-disc capacity is 80GB, the production date is early 2005, and it is used normally for a period of time. The period of mass damage is around 2008, due to this hard disk. The shipments are large, and some of the big brand machine manufacturers use Western Digital hard drives. Therefore, some customers say how the Western Digital hard drives are so bad, because they sell a lot, so they are much worse.
2: After a period of time, between 2009 and 2010, the Western Digital black disk data recovery processing method is slightly more complicated. Before this, basically 2-3 heads can definitely read the data, but During this time, some disks will not have complete seek signs when replacing N heads. The typical fault is that any one of the heads can be normally found, stopped, and both will be knocked and then stopped. There are different ways of dealing with different situations in this case. Here are a few examples:
A: Exhaustive method, replace the magnetic head again, as long as the disc is not physically damaged, it can be replaced.
B: Compared with the original head elevation angle, adjust the relevant elevation angle through the microscope, and reload it into the original disc, there will be a familiar seek sound.
C: Through UDMA's virtual read technology, single-head memory reads, reads one side and reads another.
D: Other moves, didn't think of it or didn't try it.
3: As of 2011, the black disk during that period is still very well handled. After the time starts in 2012, these black disks are gradually difficult to handle, because this hard disk has been 6-7 years now, normal. The hard disk has a life cycle of 3-5 years, which can be seen from the hard disk manufacturer's warranty cycle strategy. The current hard disk is a short-lived ghost.
After the start of 2012, the typical failure of the black disk is that any head is tapped, but with a typical failure of these hard disks, the basic circuit board is damaged, and the original circuit board is replaced with other spare parts, which is also knocking. After hitting, even part of the spare parts disk has been damaged after the replacement of the original hard disk circuit board. It can be judged that the damage of these faulty disks is basically caused by the damage of the magnetic head caused by the circuit board tapping, and the magnetic head is not damaged. Terrible, even more terrifying is the long-term tapping, causing some of the disk disc servo area to be damaged, the typical No. 0 surface will be a problem.
The typical performance of the No. 0 problem is that it is replaced with a good magnetic head, and the circuit board is also replaced. The two magnetic head factors are turned on, and the power is expressed as a tap. After tapping 3-7, it is stopped. The head is invisible, the 0# head is turned off, and the power module can be read normally, and the firmware area module can be read normally. Otherwise, the 0# head is turned off, the 1# head is turned off, the knocking sound is still the same, and the knocking will be flustered. It is unlikely (and some can make the C drive complete, and the follow-up will explain)
4: This situation can only communicate with the customer, see if the customer can accept the result, if you can accept it, continue to read a face, if you do not accept it, this kind of thing has done a lot, to communicate clearly to customers After that, most customers can accept this result, and have done a lot of such second-hand discs, half of the data received the full cost.
5: Based on years of experience, and combined with a part of the mechanical principle, one of the fundamental reasons why the 0# surface cannot be read is that the hard disk is caused by a long time of overheating and oxidation of the circuit board, etc., at some point in time ( May be not shut down after work, noon break, etc.) This time the board caused a long time tapping, but hateful of this black disk, if the circuit board damage caused by the tap, will always hit down, if not If you force a power outage, some will strike for a long time. Everyone knows that the lowest number of revolutions of the 80G hard disk is 5400 rpm. If you hit an hour, then 5400*60 points = 324000 rpm. 2-4 seconds, the number of hits an hour is between 900-1800, (you can remove the hard disk and then power on, the magnetic head makes a radial seek operation from the outer ring of the disc to the inner ring, if it is normally positioned The firmware will proceed to the next step. If the firmware area is not located, it will always be tapped, especially if the board is damaged. The result of long-term tapping will inevitably result in the 0# surface being unreadable, or Yes Read the front part of the region, probably from the beginning of the region into the 20G, (currently only in this case has been explained, this region might just head not long strike zone touched, all in order to properly read).
6: There is still a question, why are the same tapping areas, why the 0# face can't be read, and the 1# face can be read without a bad track. At present, this situation cannot be resolved (there are related physics experts). To explain, thank you).
7: Regarding the sisters of the black plate, (commonly known as Bai Fumei), the Western Digital White Cover Plate is a lot of luck. As of now, the success rate of the white disk is very high, and the compatibility of the magnetic head is also better, a better advantage. Even if you change the head to three times, you can easily copy the data by UDMA's virtual RAM loading method. It does not need to find the disk hot swap to read the data. The specific reasons and solutions are as follows. What time
A: The ROM and module version of the black disk starts with 0XXX, and the ROM and module versions of the white disk basically have the beginning of 1XXX. The version starting with the test 1XXX can be directly read by virtual mode, and the black disk will not work. Most of them need to read one or more faces by means of heat exchange, but the white plate also has a drawback and is easy to scratch. Usually, the middle inner ring and the outer ring are scratched, etc., and the general cause is part. Ultra-thin chassis rollover, and long-term tapping, etc., but why the white disk has a high success rate, a key factor is that the manufacturer later discovered this defect, designed a seek self-test circuit on the circuit board and found A hard disk that cannot detect the signs of seeking for a long time, and automatically turn on the automatic stop test to protect the hard disk from serious damage caused by long-time tapping.
B: Regarding the hot-exchange technique of the multi-head disk, generally more than two heads, due to the difference in physical elevation angles, all of the spare parts with the same head elevation of two heads (of course, there are a few for the discs, a few) Part of the hard disk with different elevation angles, this time the heat exchange to read, you need to read one face and one face, the trick is to read the 0# face first, if the 0# face can be read, view the relevant partition information, recommended from the second The partition starts to read. Generally, the probability of bad sectors appearing on the C drive is large. Therefore, it is not recommended to read the production time in the C drive. After reading the subsequent partitions, read a partition. Of course, the customer specifies to restore the C drive. Except for this, the disk is a four-head hard disk. When reading the last one, if you can see the hard disk partition and bitmap information, you can read it according to the existing data directory, saving some time and specificity. Restore the required data. If the hot swap does not modify the RAM-related direct read, it will cause the read to a certain header to stop, and the next read of the next header cannot be performed. An abnormal sound is emitted, but after adjusting the head's hidden RAM, the effect will be much better and the reading will be smoother.
C: Regarding the matching of the hot-exchange spare parts, try to find the same color, the motor looks the same, and everything needs to be the right person, can not be mismatched, or not dripping.
About the current black disk can be repaired and data recovery:
1: Eliminate the board PCB problem first, and now there are some boards caused by the knock
2: After replacing the magnetic head, close the 0 head and open the 1 head to come out. The customer can accept part of the data.
3: Most of the white covers can be made. Only some of the hard disks may have bad sectors, causing some files to be damaged.
4: The board is burnt, the surface of the disk is smoked, and the data is basically restored after cleaning.
5: The motor is damaged. After replacing the motor (single disc motor adjustment is skillful)
6: It is not the head damage that is done according to the opening method.
7: Unknown factors are damaged, and unknown factors are fixed.
8: There are many other reasons that cannot be explained.
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