This is a case of data recovery on a WD SMR HDD (WDC WD40EDAZ-11SLVB0) that was brought to the engineer after the client had tried using various other data recovery tools and failed. The client was unable to retrieve their lost data due to a format issue with the SMR HDD.

The engineer first backed up the second level translator-module 190 and then proceeded with the data recovery process. They repaired module 190 and obtained the following results:

2022/10/25 09:41:14 —T2 analysis—

2022/10/25 09:41:14 —————————-

2022/10/25 09:41:14 Checking SIT:

2022/10/25 09:41:14 SIT Checking…OK!

2022/10/25 09:41:15 **********Vacant nodes count = 0 Overlapped nodes count = 0

2022/10/25 09:41:15 Traversal completes

2022/10/25 09:41:15 —Param—

2022/10/25 09:41:15 T2 Format:LBA64V2

2022/10/25 09:41:15 Capacity 512:7814037168

2022/10/25 09:41:15 Capacity 4K:976754646

2022/10/25 09:41:15 Root:8192

2022/10/25 09:41:15 Entry pre node:29

2022/10/25 09:41:15 Max entry sects:65535

2022/10/25 09:41:15 Node size:256

2022/10/25 09:41:15 —Summary—

2022/10/25 09:41:15 Node count:198850

2022/10/25 09:41:15 Uesd count:38690

2022/10/25 09:41:15 Free count:160160

2022/10/25 09:41:15 —T2 modules—

2022/10/25 09:41:15 T2 size in sectors:455808

2022/10/25 09:41:15 Data pos:13C6800

2022/10/25 09:41:15 Block size:4096

2022/10/25 09:41:15 Free Node ID:38691

2022/10/25 09:41:15 Entry Count:781243

2022/10/25 09:41:15 Used Entry:620135

2022/10/25 09:41:15 Total node count = 198850 Used:38690

2022/10/25 09:41:48 Sort LBA

2022/10/25 09:41:51 **********Vacant nodes = 0 Overlapped nodes = 0

2022/10/25 09:41:51 Valid data = 3544.93(GB) Unallocated = 181.09(GB)

2022/10/25 09:41:51 Vacant nodes count:>=0