Here's a great case study on data recovery. The patient drive, a ST1000VX005-2EZ102 model with serial number Z9CC69D2, was firmware locked, and the data area was inaccessible.

Drive Details:
Model: ST1000VX005-2EZ102
Serial: Z9CC69D2
Firmware: CV11
Capacity: 1953525168 (931.51GB)
Sector size: 4096
Number of heads: 2

Rst 0x40M
2Sync:01 0E

EDAC Value = 00000000FFFFFFF5

EDAC Value = 00000000FFFFFFF5
Retry delay

EDAC Value = 00000000FFFFFFF5

EDAC Value = 00000000FFFFFFF5
Retry delay
LD: Size:00000028 HBlocks:0000 Size:002BD17F HBlocks:0032 Size:00282A49 HBlocks:0032 FlashRestore 00000000 00000028 ECBD
PP: Size:0000B400 HBlocks:0000 FlashRestore
PVTSize: 000150C8 CompSize: 000002B2 DeCompSize: 000150C8 00000000 000002B2 9E03
2Sync:00 04
DSP022B
No HOST FIS-ReadyStatusFlags 0002A1A1
2Sync:01 0C
Boot 0x40M

SpinUp
RECOV Servo Op=0100 Resp=0005
RECOV Servo Op=0055 Resp=0005[LBA=0x00006B6F]N[LBA=0x00006C28]N0[LBA=0x00006D5D]N0[LBA=0x000070A1]N0[LBA=0x000070C2]N0[LBA=0x0000737C]N0[LBA=0x000073EB]N0[LBA=0x000074EE]N0[LBA=0x00007500]N0[LBA=0x0000775C]N0

Trans
Rst 0x40M
2Sync:01 0E
2Sync:01 0E
2Sync:01 0E
2Sync:01 0E
2Sync:01 0E

(P) SATA Reset

LD: Size:00000028 HBlocks:0000 Size:002BD17F HBlocks:0032 Size:00282A49 HBlocks:0032 DiscRestore 00000000 00000028 04ED
PP: Size:0000B400 HBlocks:0000 DiscRestore
PVTSize: 000150C8 CompSize: 000002B2 DeCompSize: 000150C8 00000000 000002B2 9E03
2Sync:00 04
DSP022C^c

ASCII Diag mode

F3 T>^l

Diagnostic Port Locked

The user encountered several error codes during the recovery process, including the EDAC Value of 00000000FFFFFFF5 and Retry delay. They also observed bad sectors in the front, middle, and end parts of the data areas, which prevented access to some system files.

After repairing the firmware area, the user tested the data area and discovered some bad sectors at the front, middle, and ending parts of the data areas, which were inaccessible.

To recover most of the data, the user set up a head map, edited the LBA range to image the patient HDD by heads within data recovery equipment. Fortunately, most of the data was recovered, with only a few missing system files that were not important.

It's important to note that data recovery cases like these can be tricky and require the proper tools and expertise to execute. Therefore, it's always recommended to seek professional data recovery services to ensure the highest chance of successful data recovery.