November, 2008 | DataRecoveryUnion.com

When the substitution (Assign) mechanism is used in a drive the latter records to the ID field of a BAD sector the flag of the relocated sector and writes to the data field the number of the reserved sector, i.e. the one, which should be accessed for data recording or reading.…

Hard Disk Repair

Firmware data (service information)

DATARECOVERYUNION.COM15 years ago5 years ago011 mins

Firmware data is necessary for functioning of internal HDD circuits and as a rule it remains hidden from users. Firmware data can be subdivided into the following types: Servo information or servo fields; Low-level format; Resident firmware microcode (operational programs); Configuration tables and settings; Tables of defects.…

Hard Disk Repair

Modern Hard disk drive

DATARECOVERYUNION.COM15 years ago5 years ago019 mins

Introduction Brief architecture description, the main problems of modern hard disk drives, methods of HDD servicing and repair of simple malfunctions, SMART, passwords. The article is intended for data recovery specialists, technicians servicing computer equipment, network administrators and experienced users. Drive construction A drive consists of a mechanical part – head-and-disk assembly (HDA) and a printed circuit board (PCB).…

Hard Disk Repair

Hard Disk Details(11)

DATARECOVERYUNION.COM15 years ago11 years ago07 mins

Random Notes and Ideas For Data Recovery 1. Drive goes to sleep, replace the board live 2. Partitions start on Cylinder Boundaries 3. Hard Drives have a Safe Mode 4. You can fix LaCie problems with a Mac mounting them in the system 5.…

Hard Disk Repair

Hard Disk Details(10)

DATARECOVERYUNION.COM15 years ago5 years ago06 mins

Matching Serial Numbers on Hard Drives This link is where I keep track of documentation on how each hard drive needs to be matched for a working donor drive. I get this any where I can, use it if you can, and if you happen to find something out please let me know so I can add it to the collection!…

Hard Disk Repair

Hard Disk Details(9)

DATARECOVERYUNION.COM15 years ago5 years ago07 mins

Slide 4500: Doing a Platter Swap for a Single Platter List of items needed: The first step is to get a hard drive as close to identical as the bad drive you have that is a working drive. At the bottom of this paper you will find help about matching hard drives and serial numbers.…

Hard Disk Repair

Hard Disk Details(8)

DATARECOVERYUNION.COM15 years ago5 years ago05 mins

Slide 4259: Head Replacement Section This is the only section from last year I kept and it is because this is directly related to fixing this click of death problem. NOTE: If there is only one platter it might be easier to move the platter than to move the assembly.…

Hard Disk Repair

Hard Disk Details(7)

DATARECOVERYUNION.COM15 years ago6 years ago08 mins

Slide 3791: The cause of the click is from four possible areas, all resulting in the SA not being able to be read.1. System Area of the drive cannot be read because the platter is scratched.2. The head itself has a problem and cannot read the SA area.…

Hard Disk Repair

Hard Disk Details(6)

DATARECOVERYUNION.COM15 years ago6 years ago013 mins

Slide 2840: The GMR (giant magnetoresistive) head is the current head used on most hard drives. This head uses high end physics I do not claim to understand. The only major difference is the way the head has been changed to read perpendicular.…

Hard Disk Repair

Hard Disk Details(5)

DATARECOVERYUNION.COM15 years ago6 years ago010 mins

Slide 2221: When the drive is manufactured it is known that there is going to be errors in every drive. Drives use ECC to correct most errors and if ECC can correct the error then the sector is never marked as bad. …

November 2008

Two mechanisms of defect relocation