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File system journaling won't prevent all disk damage
Authored by: gmachen on Jan 16, '04 08:15:49PM

> If I was getting 5 or six errors on a backup, I would be tearing my system apart looking for bad hardware.

I apologize: In my haste I failed to mention - which changes the meaning completely - that ...

1) A backup/verify went fine.
2) Later - following at least one restart - I discovered disk directory damage, notwithstanding Journaling, in Disk Utility's Disk First Aid.
3) Disabled Journaling, successfully repaired directory damage in Disk First Aid, re-enabled Journaling.
4) Ran the backup program's verify and observed the failures.


> Either that or you are in a very intense cosmic ray area and should run for your life! 8-0

McKee, W. R., McAdams, H. P., Smith, E. B., et al.
"Cosmic Ray Neutron Induced Upsets as a Major Contributor to the Soft Error Rate of Current and Future Generation DRAMs"
1996 IEEE Annual International Reliability Physics, pp. 1-6, 1996.

Tosaka, Y., Satoh, S., et al.
"Cosmic Ray Neutron-Induced Soft Errors in Sub-Half Micron CMOS Circuits"
IEEE Electron Device Letters, V. 18, N. 3, pp. 99-101, March 1997.

Ziegler, J. F., Nelson, M. E., Shell, J. D., et al.
"Cosmic Ray Soft Error Rates of 16-Mb DRAM Memory Chips"
IEEE Journal of Solid-State Circuits, V. 33, N. 2, pp. 246-252, February 1998.



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