# Investigating macOS Recovery Partition 

~ sudo diskutil mount /dev/disk4s5

~ afsctool -l -vvv /Volumes/Recovery
/Volumes/Recovery/F755F5FD-9550-4610-B127-97D0C2D93C0C/usr/standalone/firmware/arm64eBaseSystem.dmg:
File size (uncompressed data fork; reported size by Mac OS 10.6+ Finder): 1773598360 bytes / 1.77 GB (gigabytes, base-10)
File size (compressed data fork): 721085489 bytes / 687.7 MiB
Compression savings: 59.3%
Number of extended attributes: 0
Total size of extended attribute data: 0 bytes
Approximate overhead of extended attributes: 536 bytes

~ sudo umount /Volumes/Recovery

# Applying Compression to Asahi Recovery

~ sudo diskutil mount /dev/disk1s4

~ sudo afsctool -c -T LZVN /Volumes/Recovery/CEFB0E61-0DB3-4010-9731-A6F392D0DFE1/usr/standalone/firmware/arm64eBaseSystem.dmg

~ ❯ afsctool -l -vvv /Volumes/Recovery/CEFB0E61-0DB3-4010-9731-A6F392D0DFE1/usr/standalone/firmware/arm64eBaseSystem.dmg
/Volumes/Recovery/CEFB0E61-0DB3-4010-9731-A6F392D0DFE1/usr/standalone/firmware/arm64eBaseSystem.dmg:
File is HFS+/APFS compressed.
Compression type: LZVN in resource fork (8)
File resource fork size: 738512918 bytes
File DECMPFS attribute size: 16 bytes
File size (uncompressed; reported size by Mac OS 10.6+ Finder): 1785808536 bytes / 1.79 GB (gigabytes, base-10)
File size (compressed): 738516992 bytes / 704.3 MiB
Compression savings: 58.6%
Number of extended attributes: 1
Total size of extended attribute data: 75 bytes
Uncompressed file size reported in compressed header: 1785808536 bytes