In the computer CMOS stored information of hard drive, basically have hard disk type, capacity, cylindrical number, head count, each sector number, addressing mode content, to the hard disk parameters to illustrate so that the computer hard drive right access. When CMOS power lost or for an error, hard disk Settings may be lost or error, hard disk access is not correct. This kind of situation we have to reset the hard disk parameters, if have prior down hard disk parameters or have some anti-virus software prior backup CMOS information, need to hand back can; Or you can also use the BIOS setting (setup) of the "automatic detection hard disk type" (HD type auto detection) function, general also can get the right result.

Data recovery is not unfamiliar for all of us , like mistakenly deleting files, or damaged partition table, lead to a data loss, I'm afraid that everyone would experience it. When we want to save the file, the operating system first find free in DIR area for the file name, size and area to create time and so on the corresponding information, and then in DATA DATA area find free area will file save, then the DATA of the first write DIR area, at the same time, complete FAT table filled, the concrete action and file read action almost. Win9X operating system files deleted work is very simple, just in this district directory will file of the first character to "E5" to say the documents have been deleted, and rewrite the boot sector of the second sectors said the partition with the size of the space at the corresponding information.

The concept of a data recovery

Data recovery refers that a data loss to keep in storage medium of data on resumed, for users. Even if the data is deleted or hard disk failure, as long as no serious damage in medium, data can be restored. As in since disk is formatted or data was mistakenly delete, most of the data is still not damage, by a recovery software can recover the data. But, in the medium badly damaged or data are covered, data cannot be restored

Generally speaking, the commonly used data recovery methods have the following three: use the system itself restores function recovery data, using professional data recovery soft software and hardware combines' data recovery. These methods each have each the advantages of when to use which method, according to the data are the severity of the damage and the purpose of the data recovery, the concrete analysis.

Use Professional Data Recovery Software

When the files are deleted (and remove from the recycle bin), FAT table or disk root zone file information by the virus caused by erosion lost, physical fault cause FAT table or disk root directory area do not read or disk format to cause all documents information lost case, can use data recovery software such as FinalData , NortonUtility and Data recovery mac of data recovery. Data recovery software can through the direct scanning target disk, extraction file information (including name, file types, the original location, create date, delete date, file length, etc), the user can according to these information easily search and restore his need to file, and even in data file has been part of the cover later, through some data recovery software can also will rest file recovery out. For example, FinalData is one of the best data recovery software, has strong data recovery function, and simple operation, widely used. FinalData can through the scanning disk to document search and recovery, it doesn't rely on directory entry and FAT table records of information, so that it can be the entire catalogue entry and FAT table were destroyed the data recovery, even in the disk guide area is destroyed, and the zoning all information lost (such as the hard disk to partition or format). And if usre wanna recover lost photos, try the photo recovery for mac software.

Software and Hardware Combined Methods

Software and hardware combined with the method of data recovery when file damage is severe or disks have physical damage, simply use the software to recover the data may find it difficult to achieve the desired effect. In this case, the best method is to data recovery tool software and specialized data recovery combination instrument for data recovery. Some data recovery companies have the special data recovery instrument. This instrument has to adapt to all kinds of storage media interface can be very convenient plug-and-socket such as disk drives, system, floppy disk, digital memory card and all kinds of other storage medium, different interface type of disk may also directly to hook up. When use to restore disk first in testing, according to the test results to determine the recovery strategy. Usually, we get a restore disk, the first to carry on the examination, so as to determine whether can recover, and to what extent can restore. It can also recover data automatically in before to be data recovery for backup.

Use System Itself to Recover Lost Data

use of system itself the reduction of function recovered data Some operating system and application itself with data reduction and record The function of information user operations, use these functions can be reached on data The purpose of the complex. Such as the operating system have data collection the reduction of work Can, in normal circumstances, the data is deleted, often just delete to return the station, the data remaining in the disk. If no empty recycle bin, Can use recycle bin restore function very easily to data recovery The original position. Some system software and application software to already use File also have corresponding to remember. mac hard drive recovery software is a such a professional and powerful software which can not only help you recover lost data from Mac hard drive, but also can assist you to recover data from external hard drives, iPod, USB drive, SD card, and other storage media. It would be the best Mac Hard Drive Data Recovery software since it can help recover your Mac hard drive data lost due to accidental deleting, formatting, virus infection, improper operation, unexpected power failure, and other unknown reasons.

A large number of data recovery case indicated that the data in the wrong, if can better protect the scene is no longer destroyed, can save rate is extremely high. But the reality is often data error, don't understand or casual operation of the scene damage, leading to restore rate or never recover. Most fundamental of a professional data recovery is how to protect the scene, as much as possible in the operation of the guarantee goes back. If that is what you see, because it is a brand-new disk it has to be partitioned and formatted, as I mentioned above.