RELATEED usb data recovery question
Do need help recover lost file on the usb drive
close usb
5900 RPM hard drive data recovery software free download
  • Author:urecovery
  • Publish Time:2018-09-18 08:55

About 5900 rpm and 7200 rpm hard disk
5900 to 16MB cache seek time 5.1 and 7200 to 32MB cache seek time 8.9 Which is better? All are 2 discs, the master answers. PS (SSD solid state drive can be used with the current mechanical hard disk? I plan to use SSD as the system disk later)
In fact, the shorter the seek time in actual use, the faster your computer system will be faster (not including copy and paste read), so the system disk is better to use a hard disk with a short seek time, and the ordinary needs a large capacity read and The write operation still requires a high-speed hard disk, because the write speed will be very fast, which is why even if ssd has to read the write speed and the ordinary hard disk is quite, even worse, why is it so fast?
Random read time and seek time have outperformed ordinary hard drives.
If you want to buy ssd, it is recommended to buy intel, I have a piece, after the optimization, the speed is really not fast, other brands feel a little bit convinced.
7200 rpm is good, its reading and writing speed is fast. If you use it, you should pay more attention to the problem of its bad sectors.
SSDs can be used with mechanical hard drives, provided that your interface is sufficient, but SSDs are still too expensive, cost-effective, and there are still some technical issues, such as the time to store and write memory chips (systems) If you grow up, there will be problems such as bad blocks. It is still recommended to buy a traditional mechanical hard drive.
Opening data recovery
There are many reasons why the hard disk cannot recognize the fault, but the hard disk may not be recognized. However, in general, your hard disk may have physical failure. You should protect the hard disk in time to prevent greater physical damage and affect data recovery results. . Common faults that may cause the hard disk to be unrecognized are as follows:
      1, bad sectors: the hard disk can not be identified, the hard disk can be recognized but the access speed is very slow, even when the access occurs, the crash or blue screen, the hard disk prompts I / O error;
      2, the firmware is damaged: the hard disk is not recognized, the hard disk can recognize the hardware but the model and capacity cannot be recognized;
      3, the head is damaged: the hard disk can not be recognized, the hard disk is abnormal, the hard disk is not powered, and the hard disk is automatically turned after a few seconds of power-on rotation;
      4. The motor is damaged: the hard disk cannot be recognized, and the hard disk is not powered;
      5, the circuit board is damaged: the hard disk is not recognized, and the hard disk is not powered. Head damage failure On this page, we introduce you to the physical structure of the mechanical hard disk, what causes the hard disk to be damaged, what are the symptoms after the hard disk is damaged, and how to operate properly to protect the data security. We hope that after reading this page, we can Lets you know about the recovery of open data and protect your data to the greatest extent possible. First, the internal structure of the hard disk Mechanical hard disk is the most sophisticated mechanical parts of the computer, the interior is a clean, extremely clean environment (not vacuum). When the hard disk is working, the spindle motor drives the disk disc to rotate counterclockwise at 7200 rpm or higher. The voice coil motor drives the head arm to perform the seek operation. After the hard disk starts working, the head has a height of 0.02 μm under the action of the air flow. Suspended on the disc, this distance is less than one percent of the diameter of the human hair. At this time, any severe vibration may cause the head to be damaged by the impact of the disc. Once the head is damaged, it cannot be read and written normally on the disc. Magnetic information, so the hard drive "strikes". Because the magnetic head and the disc are such sophisticated parts, the working environment must be a clean and dust-free environment. If the hard disk is working, a dust falls on the disc, just like throwing a piece on the disc. The nuclear bomb caused great damage to the data. Second, which faults need to be opened for data recovery? It can be seen from the internal structure diagram of the hard disk that the hard disk has four main functional modules:
      (1) A spindle motor for driving the disc to rotate at a high speed;
      (2) Disc, the core of the hard disk, all data is stored in the disc, the premise of data recovery can be carried out is that the disc is intact;
      (3) The magnetic head assembly (including the magnetic head, the magnetic head arm, the voice coil motor, and the control chip), which is a read/write component of the hard disk for reading and writing data on the disc;
      (4) A permanent magnet used to power the head arm.
      Among the four functional modules, the probability of damage to the head group and the spindle motor is high. Once they are damaged, they can only be replaced by intact parts by opening the disk cavity to read the information on the disc and complete the data. restore.
 Magnetic head assembly after hard disk removal
Figure 2. Magnetic head assembly after disassembly 3. Why is the head/motor damaged?
  Hard disk damaged head assembly
 
Figure 3. Damaged head assembly The head is the read/write part of the hard disk that is used to manipulate the magnetic media on the disc for data recording and reading. The head is a mechanical part that is more prone to failure than other electronic components in the hard disk. Any improper operation may cause damage to the head. Several common types of head damage are listed below.
The magnetic head reaches the service life and cannot correctly identify the magnetic information of the disc;
Abnormal aging
Due to design flaws or flaws, the magnetic head is advanced to the service life (the head life is not clearly defined, usually the earlier hard disk, the longer use time, and the hard disk produced in recent years, the overall life is shorter, this It is related to the increase in the storage density of the disc and the compression cost of the manufacturer. The hard disk falls from the height of the desktop and the magnetic head is damaged by the violent impact. Even if the hard disk is not energized at this time, the impact may be fatal;
4. What are the performances after the magnetic head is damaged? After a normal mechanical hard disk is powered on, the head first reads the servo program (firmware) located in the negative sector of the disc (the area that is inaccessible to the user before the 0 sector), which is equivalent to loading the hard disk itself. operating system". After the loading is completed, the hard disk is in normal working state, and the user data located after 0 sectors can be operated. When the head is damaged, it can't read and execute its own "operating system", it will "seeklessly" on the disc to seek around, and regularly emit a "beep" abnormal sound (normal hard disk is in seek mode) It will also make a slight noise, but it can only be heard in a very quiet environment). Some manufacturers (such as Samsung), after the head is damaged, to protect the disc from being damaged, after several attempts to read the servo program, the spindle motor is stopped to rotate, and the head is returned to the landing zone. The following are some of the phenotypic forms of damaged heads. Some of them appear at the same time, some appear separately. They all indicate that your hard disk has a physical failure. You need to power off the hard disk!
Fifth, the wrong operation after the damage of the magnetic head! People have luck. When the system fails to boot and the hard disk is unrecognizable, most people will restart the computer repeatedly. After a certain startup, the hard disk can self-heal and return to normal. In fact, the damage to the head is permanent and cannot be cured! It is precisely these attempts by the user that may cause the damaged magnetic head to continuously contact the disc, scratch the disc, and cause the magnetic powder containing the data to fall off, resulting in irreparable loss. Don't believe that in the movie, the hard drive will be broken, burned, and corroded. The data recovery mechanism can still restore the data to normal. The movie is beautiful, the reality is cruel, and once the magnetic powder on the disc falls off, the data is permanently lost!