How to Fix Invalid B-tree Node Size Error and Recover Data?

“Hi, I was trying to access my MacBook hard drive data on desktop using usb. The MacBook drive showed up in disk utility but not on desktop. So I made an effort to verify and repair the disk, but I got a message stated that “invalid B-tree node size”. What does invalid B-tree node size mean? How do I get it solved and recover my MacBook hard drive data?”

What is invalid B-tree node size?

Invalid B-tree node size is an error that appears when you try to access data on severely corrupted Mac volume.

Your Mac volume is a collection of information like files, directories, file threads, directory threads etc. Whenever you save a file on Mac, OS X creates a unique entry for the file in B-tree format on the index table. So each time you access the file, OS X navigates this tree to fetch the file. When B-tree has any issue or if it is corrupted then OS X fall short to go through the tree and above (or alike) error messages pops-up. This issue may also prevent your Macintosh from booting and leads to data loss/inaccessibility.

What are the causes for Invalid B-tree node size error?

  • Broken/corrupted B-tree structure
  • Corrupt file system, header file
  • Boot Sector errors
  • Damaged/missing catalog node files
  • Abrupt shutdown of Mac machines
  • Malware assail
  • OS X failure
  • Modification in BIOS setting
  • Interrupted read/write cycle

Safeguard your data first:

You can fix this error using troubleshoot methods that are suggested in next session. But, before that you must perform an immediate recovery process to recover entire data from Mac drive, as this error can cause permanent data loss. So follow this step by step guideline to copy all files and folders from erroneous drive to secure location.

  • Click on above located Download Now button
  • Launch Yodot Mac Data Recovery using on-screen commands
  • Select Volumes Recovery
  • Choose erroneous external drive
  • Opt for Standard Scan
  • Hit Skip or Mark All option
  • Go through File Type View or Data View
  • Mark files which you want to save
  • Mention location on system drive to store files

How to fix Invalid B-tree node size issue?

1. Disk Utility:

  • Restart Mac and hold Command and R keys
  • Release keys when Apple logo appears
  • Launch Disk Utility
  • Click Continue
  • In sidebar select the disk that you want to repair
  • Click on First Aid
  • Click Run
  • If Disk Utility reports that the disk is OK or repaired, then you are done
  • If not try to repair it again

2. FSCK Command:

  • Start Mac and hold Command and S keys
  • Hit return after every command
  • Type fsck_hfs -r -name of the drive-
  • Run the command again if it reports, problems are fixed
  • When it’s completed type reboot

3. Reformat the Drive:

  • Restart Macintosh and hold Command and R keys
  • Launch Disk Utility and Continue
  • Select your Mac hard drive from the left side list
  • Click Erase tab present at the top
  • Set the format type to Mac OS Extended (Journaled)
  • Enter drive name that need to be reformatted
  • Click Erase button
  • After reformatting click on Quit Disk Utility
  • Click on Reinstall Mac OS X to install fresh copy of OS

Complete solution for Mac hard drive recovery:

Never lose hope when your Mac hard drive is corrupted, as the best hard drive recovery tool is at your help. Yodot Mac Data recovery is an efficient way to recover files and folders from Mac machines screening error invalid B-tree node size. The program aids you thoroughly to retrieve entire data from corrupt, inaccessible, not booting Mac systems. Obliging interface of the application eases the recovery process even for non-technical users. The program works absolutely perfect on all versions of Mac OS and it is well-suited for restoring data from USB, pen drive, media cards, internal as well external drive and more. So you can trust the software without any second thought while your data is in trouble due to errors on Mac platform. Apart from erroneous drive data restoration, the utility helps you in scenarios like retrieving files from lost volumes on Mac, recovering deleted folders from recycle bin and so on.

Notable Points:

  • Don’t turn off computer by disconnecting power plug
  • Avoid upgrading system files