may mzhboy

Btrfs fix: partition not recognized after power loss

Problem Background

Due to an unexpected power outage during a write operation, the Btrfs partition became unrecognizable by the system and couldn't be mounted properly. Strangely, the fdisk -l command showed completely incorrect partition sizes, but the parted tool could still correctly identify this as a Btrfs partition. This was a nerve-wracking data recovery experience, and here's my complete record of the repair process for future reference.

Repair Methods Attempted

Initial Diagnosis

使用ffmpeg合并MP4文件

ffmpeg -i "Apache Sqoop Tutorial Part 1.mp4" -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate1.ts
ffmpeg -i "Apache Sqoop Tutorial Part 2.mp4" -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate2.ts
ffmpeg -i "Apache Sqoop Tutorial Part 3.mp4" -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate3.ts
ffmpeg -i "Apache Sqoop Tutorial Part 4.mp4" -c copy -bsf:v h264_mp4toannexb -f mpegts intermediate4.ts
ffmpeg -i "concat:intermediate1.ts|intermediate2.ts|intermediate3.ts|intermediate4.ts" -c copy -bsf:a aac_adtstoasc "Apache Sqoop Tutorial.mp4"

	Windows Registry Editor Version 5.00

	[HKEY_CLASSES_ROOT\directory\shell\PowerShell5Here]
	@="PowerShell5 Here"
	"Icon"="C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\powershell.exe,0"

	[HKEY_CLASSES_ROOT\directory\shell\PowerShell5Here\command]
	@="C:\\Windows\\System32\\WindowsPowerShell\\v1.0\\powershell.exe -NoExit -NoLogo -Command \"Set-Location -LiteralPath '%V'\""