Case:After Mr. Yan reinstalled the system, the computer only recognized the formula, but the data inside was gone Solution:Through consultation in all aspects, Mr. Yan learned about the data recovery related information. After contacting the data recovery company, the next day he took the hard disk to the engineer of our company to make a…
Case:A IBM X3650 server from a company in Hangzhou, during a sudden power outage, makes the server unable to turn on. This server is a file server created by 3 1TB SAS hard disks.It is the daily office information of various departments of the company, as long as the data data is exported. Solution:It was…
Case:Customers use the sudden blue screen normally, so they reinstall the system by themselves, but the operation error and the deprivation system cannot be completed. Solution:The original failure may be a bad drive in the hard disk. On this basis, users have done another destructive operation “error zone””.This operation caused the problem to complexity.Detecting the…
Case:Sandisk SD 4GB capacity SD card has taken 50 photos. I accidentally pressed all deletes, deleted all the photos on the card at one time, and no new photos were taken after deleting. Solution:Data recovery engineers have not lost and damaged the original data through data underlying analysis and detection.The lost photos are not covered,…
Case:The server is 3650 of IBM and stored as a type of EMC.The server is stored through the optical fiber channel to use a 2TB LUN.The virtualization system is ESX4.1. There are three virtual machines on this server, a Kingdee K3 ERP system, an OA system, and a IPSCAN server. Solution:First, the snapshot file deleted…
E Block
component that connects the actuator to the head/slider assemblies
ECC
Error Correction Code, detects and correct errors in a data field
Effective Seek Time
The time it takes to seek data, when all/part of the data needed is already stored in the buffer of the drive (speeds up the process)
EIDE (also ATA)
Enhanced Integrated Device Electronics, interface
Embedded Servo
Servo data that is embedded on the media. Allows the actuator to fine-tune the position of the head(s). It is a positioning signal that keeps the read/write heads positioned over the data. The advantage of an embedded servo is that the data can flow without interruptions making the drive suitable for multimedia and AV applications
ESD
Electro-static discharge
FAT
File Allocation Table
FCI
Flux Changes per Inch of data track, equals BPI
Firmware
permanent instructions and data programmed directly into the circuitry of read-only memory (cannot be erased) for controlling the operation of the computer or disk drive
Flux change
reflects the point where the direction of magnetisation reverses in order to define a binary digit (0 or 1)
Format
The arrangement of a magnetic track pattern on the media. This enables the drive to store user data, and is never altered (see also low level formatting)
Form factor
industry standard that defines the dimensions of a particular device (e.g. 5.25″, 3.5″, 2.5″)
Flying Height
the height at which the head moves over the media, a lower height, equals larger areal density
Case:What is contacted with our engineer is a brand laptop dealer. Their customer laptop hard disk is damaged and cannot read the data. The customer finds the dealer, and the dealer uses the relationship in the circle to inquire. Multiple data recovery service providers said that this model isWestern data black disk is difficult to…
Case:Unix operating system, the file system is JFS2, IBM AIX server, and LV on IBM AIX JFS2 is deleted by about 200,000 files by the upper script, which exists in different directory. Solution:After the engineer analyzes all the original LV DD to the recovery platform, the AIX JFS2 LV that is deleted by the independent…
Generally data recovery specialists can be divided into three different levels, according to their technical competence and the recovery methods they use.
1. First level’s data recovery specialists just can use the software which are developed by others. Such as the widely used data recovery software: FinalData、EasyRecovery and R-STUDIO; The system recovery software: DISKGEN (DISKMAN), etc. In fact, these are very good software. Even if a great skilled programmer is difficult to write the similar data recovery software or the better software than the above-mentioned software. However, sometimes these classical software can’t play a role with two reasons:
a). The situations of data loss are complicated and different. The software can’t be applied to every case;
b). These software don’t have thought. They use the fixed mode which is set by programmer to judge and deal with the fault. Sometimes the result may be biased or even wrong. Therefore these technicians who just can use the ready-made software have the limit capacity to deal with the data loss problem.
2. Second level’s data recovery specialists know the main file systems’ sector store rules. They can analyze data which stored on the sectors. Then fix some error system parameters by the malfunction reasons and the status of the storage medium. With the above-mentioned classical software, their problem solving skills will be greatly enhanced. When they analyze the sector’s data, they can give full play to their logical thinking skills, and then do the right operation.
3. Third level’s data recovery specialists can develop corresponding program according to their need to analyze the sectors’ data. Using these programs, the operator can quickly and accurately judge the reasons which caused the malfunction, and then find the best way to recover the data. With the above-mentioned classical software, their data recovery skill can attain the higher level. At the same times, these technicians can constantly improve these software’s function by their operation experience. Let these software can help others to detect and diagnose data loss reasons better.
We first look at the following two pictures. Picture 1 is the “BIOS CHIP” of the circuit board. When we replace the PCB, we need to swap the “BIOS CHIP” with your original PCB. Picture 2 shows the “Board Number” of the board, and the “Board Number” must be the same! FAQs of BF41-00314A PCB…
