Is there any good hard disk data recovery software for Windows 11 recommended?

attrib is a command-line tool built into Windows to modify the attributes of a file or directory, including Hidden, System, Read-only, Archive, and so on. When files are set to the Hidden or System attributes, Windows Explorer does not display them by default. When files are set to the Hidden (H) or System (S) attributes, Windows Explorer does not show them by default, and attrib can be removed to restore the visibility of the files. 

For me, attrib is the best free hard disk data recovery for PC. You can use this free tool on any Windows desktops and laptops.

File attribute storage mechanisms

Windows records file attribute flags (such as H, S, R, A) in the file system's Master File Table (MFT) (NTFS) or Directory Entry (FAT/exFAT). Windows records the file attribute flags (such as H, S, R, A) in the Master File Table (MFT) (NTFS) or Directory Entry (FAT/exFAT) of the file system.

When a file is marked as Hidden (H) or System (S), the system hides the file so that it is not visible in normal file browsing.

How to use the attrib command for data recovery

Use the attrib -h -s command to remove the hidden (H) and system (S) attributes of a file and make it visible in File Explorer as a normal file again.

attrib -h -s "C:\path\to\file.ext"

You can modify the attribute flag of a file so that it is no longer hidden by the system by using the attrib command. After the modification, the file will reappear in File Explorer (provided that the folder options are not set to "Do not show hidden files").

Additional Notes

If a file is set to read-only (R), you can use attrib -r to remove the attribute.

If a file has been deleted by mistake, attrib cannot recover it directly, but needs to be combined with a recycle bin or data recovery tool.

Some malware may use attrib +h +s to hide its files, so you can use attrib -h -s /s /d to scan the entire directory to recover the hidden files.