{"id":241,"date":"2016-08-25T02:59:08","date_gmt":"2016-08-25T02:59:08","guid":{"rendered":"http:\/\/www.macintosh-data-recovery.com\/blog\/?p=241"},"modified":"2022-11-11T05:45:37","modified_gmt":"2022-11-11T05:45:37","slug":"mac-data-recovery-broken-file-system-invalid-b-tree-node","status":"publish","type":"post","link":"https:\/\/www.macintosh-data-recovery.com\/blog\/mac-data-recovery-broken-file-system-invalid-b-tree-node\/","title":{"rendered":"Mac Data Recovery on Broken File System (Invalid B Tree Node)"},"content":{"rendered":"\n

Summary: <\/strong> The blog explains the detailed information about \u2018Invalid B-tree node error\u2019, identifies the causes of the error and the probable solution.<\/em>

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\n\n\"Mac<\/a> <\/span>\n<\/p>\n\n\n\n

Picture this! You open up your MacBook Pro running over the latest macOS and find its battery drained. You next attempt to plug it in and boot up your Mac, but it shows a flashing folder bearing a question mark. However, in a few minutes, the system starts to boot up. To be on the safer side, you then decide to back up the hard drive. Unfortunately, you are not able to do so; and, this time, when you try to start the machine, it does not boot at all. Now, when you tried the internet recovery option to get to the \u2018diskutil\u2019<\/strong>, the recovery failed, and you encountered \u2018invalid node structure\u2019<\/strong> and \u2018disk full\u2019<\/strong> message. Furthermore, when you tried resolving this issue via Terminal, the message – \u2018Volume was found corrupt and needs to be repaired\u2019<\/strong> appeared!<\/p>\n\n\n\n

The main reason behind the \u2018invalid node structure\u2019<\/u> error is the incorrect size of B-tree structure or invalid node size of B-tree. It is quite likely that the Mac file system is broken<\/em>. In this case, running \u2018fsck\u2019 in single user mode can help resolve this issue. However, in case any data loss takes place, you can recover your data using a Mac hard drive and data recovery application<\/strong><\/a>.<\/p>\n\n\n\n

If your Mac hard drive has not been formatted in the last couple of years<\/em>, this may also have triggered the issue. If the Time Machine backup is available, locate it for Mac data recovery on the broken file system.<\/p>\n\n\n\n

Since there was no clicking sound coming out of the system, and the only symptom was that the performance considerably slowed down, then it\u2019s quite probable that the issue must be the broken file system<\/em>. Now let\u2019s understand the Mac file system corruption.<\/p>\n\n\n\n

Introduction to Corrupt File System<\/strong><\/p>\n\n\n\n

File system issues in Mac may be resolved by rebooting the system in the safe mode. The Broken file system<\/em> is a common issue with Mac machines. To resolve this, reboot the Mac machine while pressing down the Shift key. It will perform a force check and error correction on the file system. Booting the system in the safe mode will delete all the cached files and start the machine in a limited working state<\/em> with only basic information.<\/p>\n\n\n\n

Introduction to Invalid B-tree Node Structure<\/strong><\/p>\n\n\n\n

Invalid B-tree node size implies that the Mac hard drive volume is damaged or has become corrupt. This leads to data inaccessibility. Each individual file on a Mac has a unique entry in the index table with a B-Tree format. Each volume on the hard drive has certain information<\/em> such as directories, files, directory threads, and file threads associated with the system.<\/p>\n\n\n\n

When an attempt to access a file is made, the Operating System parses the B-tree to locate the actual file on the hard drive.<\/u> When the B-tree becomes corrupt, and the operating system fails to parse it for locating file information, the corresponding error message appears.<\/p>\n\n\n\n

Reasons for Invalid B-tree Node Error Message<\/strong><\/p>\n\n\n\n

Several reasons are responsible for Invalid B-tree node size error. They are:<\/p>\n\n\n\n