I'm randomly getting a message "Volume hash mismatch: Hash mismatch detected on disk 1s6. Mac OS should be reinstalled on this volume."
I don't know where to begin as I've never had any issues with my iMac before.
How do I do this?
I'm backed up to iCloud, but will I still lose data if I do this?
Can someone please help me?
TIA
iMac 21.5″, macOS 13.6
iCloud is not a back up. It is a synchronization service. You won’t lose the information stored in iCloud if you reinstall macOS. You shouldn’t lose any data stored on your Mac, either, but you should still have a real back up before you reinstall macOS.
How to reinstall macOS - Apple Support
iCloud is not a back up. It is a synchronization service. You won’t lose the information stored in iCloud if you reinstall macOS. You shouldn’t lose any data stored on your Mac, either, but you should still have a real back up before you reinstall macOS.
How to reinstall macOS - Apple Support
The "Volume Hash Mismatch" typically seems to be caused by bad memory. While performing a clean install & restore may fix the issue, but it will likely only be temporary until it becomes corrupt again. I guess the drive could also be bad, or the CPU & Logic Board. If you perform a clean install of macOS by erasing the disk and you encounter this issue again later on, then it means you have a hardware issue of some sort.
Try running the Apple Diagnostics to see if any hardware issues are detected. Unfortunately the diagnostics rarely detect problems. You can try creating & using a bootable Memtest86 USB stick for a more thorough memory test to see if there are any issues.
Please follow the advise from Both previous Contributors
Some links for other users experiencing this " volume hash mismatch " issue
One common thread from some users has been doing a lot of Video Conferencing
Only intended for informational purposes
Volume hash mismatch, cannot reinstall MacOS
Monterey rev 12.4 - Hash mismatch
Please help - Terminal.app keeps crashing upon reopening - macoS Monterey version 12.4
Thank you so much for your reply. I will try this.
Thank you for the advice!
Thanks so much, I appreciate your help!
Welcome and hope this not Bad RAM
I ran the Apple Diagnostics and it said "no issues found." And now the iMac is working fine. I am not sure if I want to do anything else at this time. Or is it a ticking time bomb? ;-)
How do I resolve volume hash mismatch on Ventura 13.6.3 on iMac?
