How to recover data from an ext4 Linux partition in India
Short answer: ext4 (fourth extended file system — the default Linux file system since 2008) uses a journal that logs file system changes, making it somewhat more resilient to corruption than FAT32 or exFAT. Recovery from ext4 uses three main tools: extundelete (specifically for ext2/3/4 deleted file recovery), PhotoRec (signature-based carving for all file types), and TestDisk (partition and journal repair). The most common ext4 data loss in India is accidental during dual-boot Windows setup — a Windows resize or re-partition that overwrites the ext4 partition boundary.
ext4 recovery — tools and steps
Step 1: Mount the partition read-only before doing anything
If your ext4 partition is on a healthy drive but files are deleted or the partition is partially accessible, mount it in read-only mode before any recovery attempt: mount -o ro,noload /dev/sdXN /mnt/recovery. The ro (read-only) flag prevents any writes to the partition, and noload prevents the journal from replaying (which would write to the drive). This is critical — mounting a damaged partition in normal read-write mode allows the kernel to “fix” minor journal inconsistencies by writing to the partition, which can overwrite deleted files.
Step 2: Use extundelete for recently deleted files
extundelete is a command-line tool (available in Ubuntu/Debian repositories: sudo apt install extundelete) that reads the ext4 journal to find deleted file entries. Run: extundelete /dev/sdXN --restore-all. This reconstructs recently deleted files from journal entries. Extundelete succeeds best when: the partition is healthy but files were accidentally deleted; deletion happened recently (journal entries are overwritten over time); and the partition has not been mounted in read-write mode since deletion. Save recovered files to a different partition or external drive.
Step 3: PhotoRec for deleted partition or deep recovery
If the ext4 partition itself was deleted (overwritten during Windows setup or partition resizing), PhotoRec scans the raw sectors without needing a mounted partition. Run PhotoRec from a Linux live USB, select the drive, choose ext2/3/4 partition type if available, and let it scan. File types are recovered by signature — names and directory structure are lost. For dual-boot setups where Windows partition resizing accidentally extended into the Linux partition, TestDisk can first attempt to restore the original partition table, potentially restoring the ext4 partition boundary and allowing ext4 journal-based recovery instead of raw carving. See our Windows partition recovery guide for the TestDisk workflow that applies to both Windows and Linux partitions.
Step 4: The India angle — Windows Updates and dual-boot partition damage
Windows Update on dual-boot systems has caused ext4 partition damage in India in two documented ways. First, Windows 10 and 11 Fast Startup (a feature that doesn’t fully shut down Windows — it hibernates the kernel instead) interferes with Linux’s ability to safely mount shared drives. Second, some Windows major updates (Feature Updates) attempt to resize the Windows partition for upgrade space and have occasionally overwritten adjacent Linux partitions. Disabling Fast Startup (Control Panel → Power Options → Choose what the power buttons do → uncheck Fast Startup) before using Linux eliminates the first risk. Backing up the partition table before any Windows major update eliminates the second.
