2026-04-24

IBM malfunctions

DATARECOVERYUNION.COM02 mins

Manufacturer: IBM, drive families: DJNA, DPTA, DTLA, AVER, AVVA
Malfunction signs: A drive spins up the spindle motor, recalibrates itself, reports on readiness, BIOS identifies it correctly but at a reading attempt the drive produces “scratching” sounds and reveals numerous BAD sectors on its surfaces.

That malfunction is connected with a mismatch between the cyclical redundancy check code in the data fields and the information recorded in the sector service field. Such a situation appears when recording to a sector is unfinished. That may result from lack of contact at the connector between the PCB and HDA. That connector consists of needle-like pins touching tinned pads on the PCB (please see figure 11). With time soft solder becomes perforated and contact quality deteriorates.

Figure 11. Pin contacts of magnetic heads’ assembly connector in IBM drives (view from behind the PCB)

In order to repair that malfunction you should remove the control board, clean the old solder off the contact pads and cover them again using silver-based solder, then carefully wash the soldered location. Install the board back to HDA. Then you will have to clear the whole disk surface overwriting it with any code using freely available software (please see part 4); that will accomplish recording of correct CRC codes.

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outlook delete recovery

DATARECOVERYUNION.COM01 mins

Case:Outlook of OFFICE 2003 used by customers, about 5G of the file, deleted due to errors, and tried several recovery software can not restore files Solution:After the data recovery engineer testing, the customer found that the customer was written after deleting the file. The MFT of the mail file was destroyed. Since the customer’s mail…

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RAID Array & Server Glossary of Computer Terms (Letter F)

DATARECOVERYUNION.COM53 mins

Failback
Restoring a failed system component’s share of a load to a replacement component.

Failover
A mode of operation for failure tolerant systems in which a component has failed and a redundant component has assumed its functions.

Failover Port
A fibre channel port capable of assuming I/O requests for another, failed port on the loop. During normal operation, a failover port may be active or inactive. Failover ports assume the same loop ID and, optionally, the same node from the failed port.

Failure
A detectable physical change in hardware, requiring replacement of the component.

Fault Tolerance, Failure Tolerance
The ability of a system to continue to perform its function even when one of its components has failed. A fault tolerant system requires redundancy in disk drives, power supplies, adapters, controllers, and cabling. Mylex RAID controllers offer high levels of fault tolerance.

Failed-drive mode
A mode of reduced-performance operation that a disk array is in after a drive failure.

Failover
The automatic replacement of a failed system component with a properly functioning one. Most often used in the context of redundant external array controllers. If one of the controllers fails, failover enables the second controller to take over the failed controller’s I/O load.

Fault tolerance
The ability of a system to continue to perform its functions, even when one or more components have failed

Fibre Channel
Technology for transmitting data between computer devices at a data rate of up to 2 Gbps (two billion bits per second), especially suited for connecting computer servers to shared storage devices and for interconnecting storage controllers and drives.

Fibre Channel is expected to replace the Small System Computer Interface (SCSI) as the transmission interface between servers and clustered storage devices. It is also more flexible: devices can be as far as ten kilometers (about six miles) apart. The longer distance requires optical fiber as the physical medium; however, fibre channels also work using coaxial cable and ordinary telephone twisted pair wires.

Flash ROM
Memory on an adapter containing software that can be reprogrammed without removing it from the board.

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2060-800055-002 WD PCB Circuit Board

DATARECOVERYUNION.COM04 mins

HDD Printed circuit board (PCB) with board number 2060-800055-002 is usually used on these Western Digital hard disk drives: WD30EFRX-68N32N0, DCM HANNHT2MHB, Western Digital 3TB SATA 0 Hard Drive; WD40EFRX-68N32N0, DCM HHRNNT2MHB, Western Digital 4TB SATA 3.5″ Hard Drive; WD40PURZ-85TTDY0, DCM HHNNNT2CHB, Western Digital 4TB SATA 3.5″ Hard Drive; WD40EFRX-68N32N0, DCM HHNNNT2CAB, Western Digital 4TB…

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