Disk Utility error: btn: invalid btn_btree.bt_key_count (expected 6892005, actual 6892070)

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glassman47 Author

Level 1

8 points

Disk Utility error: btn: invalid btn_btree.bt_key_count (expected 6892005, actual 6892070)

I have a MBP (Retina, 13 inch, Early 2015) running up to date Mojave OS (version 10.14.1).

3.1 GHz Intel Core i7, 16 GB 1867 MHz DDR3. Startup Disk: Mac HD

I have recently backed-up using Time Machine.

Today I ran Disk Utility and got this error message.

---

Checking snapshot 1 of 10.

error: btn: invalid btn_btree.bt_key_count (expected 6892005, actual 6892070)

Snapshot is invalid.

The volume /dev/rdisk1s1 could not be verified completely.

File system check exit code is 0.

Restoring the original state found as mounted.

---

After researching this error message, I did the following.

1. At startup, I entered recovery (Command + R), mounted the "ghost" MacHD drive and ran First Aid twice. Rebooted. When I ran Disk Utility I still have this error message.

2. I then at startup did Command + S, and entered "/sbin/fsck-fy", pressed return and got a message that this file could not be found.

Can someone tell what this error message means?

What I should do next?

Serge

Posted on Dec 3, 2018 5:31 AM

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Answer 1

foo__

Level 1

14 points

Dec 29, 2018 8:24 AM in response to greval

I was having the same problem and this is how I had to fix it:

https://discussions.apple.com/thread/8564919?answerId=250086718022#250086718022

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Answer 2

glassman47 Author

Level 1

8 points

Dec 4, 2018 10:19 AM in response to glassman47

I've done a SMC reset and a PRAM reset. I've reinstalled OS X. When I ran Disk Utility, I still have this error message. I've got a Genius appointment in 10 days. Here's the info from the latest run on DU. Anyone have an idea what is going on? Much appreciated.

Running First Aid on “Macintosh HD” (disk1s1)

NOTE: First Aid will temporarily lock the startup volume.

Verifying file system.

Volume could not be unmounted.

Using live mode.

Performing fsck_apfs -n -l -x /dev/rdisk1s1

Checking the container superblock.

Checking the EFI jumpstart record.

Checking the space manager.

Checking the space manager free queue trees.

Checking the object map.

Checking volume.

Checking the APFS volume superblock.

The volume Macintosh HD was formatted by hfs_convert (748.21.6) and last modified by apfs_kext (945.220.38).

Checking the object map.

Checking the snapshot metadata tree.

Checking the snapshot metadata.

Checking snapshot 1 of 1.

error: btn: invalid btn_btree.bt_key_count (expected 6840313, actual 6840378)

Snapshot is invalid.

The volume /dev/rdisk1s1 could not be verified completely.

Serge

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Answer 3

Dec 11, 2018 2:12 PM in response to glassman47

Have almost the exact same error. And it seems to have arisen just after a recent macos update. Time machine won’t backup since that install.

Never had an issue before with this original apple ssd.

Very frustrating.

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Answer 4

Dec 17, 2018 7:42 PM in response to n.b.lindenberg

Since this new update, I've been having the same issues. I've been noticing random hangups only being resolved by holding down the power button. Beside the screen fading away, this is the only software issue I've had with my 2015 MBP.

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Answer 5

Dec 16, 2018 12:16 AM in response to bennybonez

Same here - same exact message.

A lot of my apps have started not responding since I updated to Mojave.

Is there a solution?

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Answer 6

foo__

Level 1

14 points

Dec 28, 2018 4:40 PM in response to glassman47

I have this problem also after upgrading to Mojave. Time Machine backups no longer work and if I run disk first aid on the Mac OS drive, get the same invalid_btn.... error message.

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Answer 7

greval

Level 1

4 points

Dec 29, 2018 7:38 AM in response to glassman47

I'm having the same problem on my MBA mid-2012.

Since last night it has been hanging after a few minutes of booting.

Running First Aid now and all "snapshots" are returning btn: invalid.

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Answer 8

Dec 29, 2018 6:45 AM in response to foo__

I did a time machine restore and it somehow still had disk errors, so I had to erase the disk and then restore selected files from the time machine backup. That took about 8 hours (much slower than a full time machine restore).

My advice is do the restore as quickly as possible before you have too much new data (which you'll need backup manually--I copied to an iCloud folder).

I really think there was a recent update that caused this disk error. Fingers crossed it won't happen again.

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Disk Utility error: btn: invalid btn_btree.bt_key_count (expected 6892005, actual 6892070)

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