15000 RPM hard drive data recovery software free download
- Publish Time：2018-09-18 09:04
What is the main purpose of 15000 rpm hard disk?
Hard disks with a speed of 15,000 rpm are generally used for professional hard disks of servers. They use a dedicated SAS interface, which is powerful but expensive.
A typical 15,000-rpm hard drive such as Seagate Cheetah, product model ST3600057SS, the parameters are:
Hard disk capacity: 600GB
Interface type: SAS2
Speed: 15000 rev / min
Interface rate: 6Gb/s
What does the hard drive 7200 rpm and 15,000 rpm mean? ? ? Is the higher the number, the better?
The correct way to write is 7200 rpm, 15,000 rpm. This parameter describes the number of revolutions per minute of the hard disk platter. In general, the higher the number of revolutions, the better the performance of the hard disk.
The working principle of the mechanical hard disk is that the disk rotates at a high speed under the drive of the spindle motor, and the magnetic head moves in the radial direction to read and write data on the disk. Obviously, the faster the disk rotates, the more sectors are passed under the head per unit time, and the hard disk has better read and write speed. However, the higher the number of revolutions, the more expensive the price. Therefore, the number of desktop hard disks used in the ordinary civilian market is generally 7200 rpm, and only 15,000 rpm or even higher number of hard disks will appear on the server hard disk.
Data recovery category editing
Logical fault data recovery
A logical failure is a failure related to the file system. The writing and reading of hard disk data is realized by the file system. If the disk file system is corrupted, the computer cannot find the files and data on the hard disk. Data loss caused by logical failures, most of which can be recovered by data recovery software.
Hardware failure data recovery
Hardware failures account for more than half of all data accidents, such as circuit failure caused by lightning, high voltage, high temperature, mechanical failure caused by high temperature, vibration collision, high temperature, vibration collision, physical bad track sector failure caused by aging of storage medium, Of course, there are accidental loss of corrupted firmware BIOS information and so on.
The data recovery of the hardware failure is of course the first diagnosis, the right medicine, the corresponding hardware failure is repaired first, and then the data is successfully recovered according to the repair of other soft faults.
Circuit failure requires us to have a circuit foundation, and we need to have a deeper understanding of the detailed working principle of the hard disk. Mechanical head failure requires a workbench or workshop above level 100 for diagnostic repair work. In addition, some hardware and software maintenance tools are needed to repair the fault types such as the firmware area.
Disk array RAID data recovery
The storage principle of the disk array is not explained here. Please refer to the knowledge of the array of the site. The recovery process is to eliminate hardware and soft faults first, then analyze the parameters such as array order and block size, reorganize with array card or array software or use DiskGenius virtual. Reorganize RAID , after reorganization, data can be recovered in the usual way.
Data recovery method
Hard disk data recovery
Hard disk soft fault: system failure: the system can not start normally, the password or authority is lost, the partition table is lost, the BOOT area is lost, the MBR is lost; File loss: misoperation, misformatting, mis-cloning, accidental deletion, mis-partitioning, virus destruction, Hacking, PQ operation failure, RAID disk array failure, etc.; File corruption: Damaged Office series Word, Excel, Access, PowerPoint file Microsoft SQL database recovery, Oracle database file repair, Foxbase/foxpro dbf database file repair; Corrupted mail Outlook Express dbx file, repair of Outlook pst file; repair of corrupted MPEG, asf, RM and other media files.
Hard disk physical failure
CMOS does not recognize the disk; there is often a kind of "咔嚓咔嚓" head impact sound; the motor does not turn, there is no sound after power-on; the head misplacement causes read and write data errors; startup difficulties, frequent crashes, formatting failure, dyslexia; The check is normal, but the hard disk cannot be found in "Disk Management"; the board has obvious burn marks. Disk physical fault classification: Disk failure: head burnout, head aging, head chip damage, motor damage, head offset, zero track damage, a large number of bad fans, disk scratches, magnetic group deformation; circuit board failure: circuit board Damage, chip burnout, broken needle break. Loss of firmware information, firmware corruption, etc.
U disk data recovery
U disk, USB flash drive, XD card, SD card, CF card, MEMORY STICK, SM card, MMC card, MP3, MP4, memory stick, digital camera, DV, micro hard disk, CD, floppy disk and other storage devices. When the data medium such as the hard disk, the mobile disk, the flash disk, the SD card, or the CF card is damaged or the circuit board is faulty, the head is offset, or the disk is scratched, the data is repaired by the method of opening replacement, loading, positioning, and the like.
Digital camera memory cards, such as SD cards, CF cards, memory sticks, etc., U disk, and even the latest SSD solid state drives. Since there is no disk, no disk, the stored data is a FLASH chip. In the event of a hardware failure, only a handful of data recovery companies can recover such media. This is because the general data recovery company needs to match the corresponding master chip when doing such media, and the master chip needs to be removed after buying the spare parts. After you open it, you can know that the spare parts have been dismantled and destroyed immediately. If the main control chip cannot be paired, the data cannot be recovered. Even if it happens to be equipped with a master model, it does not mean that data can be read, so the cost and cost of recovery is very high. The average data recovery company encounters such media, the success rate is very low, and basically gives up. This recovery technology and principle is the practice of most data recovery. However, for the recovery of FLASH class media, a new data recovery technology has been developed, which can directly read the code in the FLASH chip through a special hardware device without a pairing master chip, and then be equipped with a special algorithm and Software, through manual combination, directly reorganize FLASH data. This recovery method and principle, the success rate is almost 100%. However, due to the high cost of such equipment and the high requirements for data recovery technology, engineers must not only be proficient in hardware, but also need software, but also be proficient in file systems. Therefore, only a few data recovery companies in the country can achieve a success rate close to 100. %, some companies have paid a high price to purchase this equipment, due to the limitations of engineers' technology, they will not be used and cannot be recovered. Although the problem of FLASH recovery is technically solved, the cost of such recovery is very high for the customer, which is higher than the hardware failure recovery price of the hard disk. The recovery fee of 2G or so is close to 1,000 yuan, and the recovery cost of 32G and 64G capacity is basically 3000-5000.
Unix data recovery
Data recovery based on Solaris SPARC platform, Solaris data recovery based on INTEL platform, SCO OPERNSERVER data recovery, HP-UNIX data recovery, IBM-AIX data recovery
Linux data recovery Data backup in the Linux operating system is an important task and responsibility of Linux system administrators. Traditional Linux server data backup methods are many, and the means of backup are also diverse. A common way to back up Linux data is to simply copy and copy the data to other areas of the disk using the TAR command. There is also a safer approach to automatic backup of two machines, not all data stored on a computer, otherwise once the hard disk of this computer is physically damaged, then all data will no longer exist. Therefore, dual-system backup is the basic requirement for data security of commercial servers.