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Yes, that's true. However, even if you're not using ECC RAM, you're much better off using ZFS or btrfs, because due to their frequent checksumming and checksum validations, these filesystems will usually detect memory corruption much sooner than if you didn't use them. This could be immensely helpful in scenarios such as the great^4-parent poster. Note that bad hardware is not limited to non-ECC RAM. ZFS and btrfs help just as much in detecting other kinds of bad hardware, such as bad SATA cables, bad disks, bad disk/SATA controllers, bad CPUs, bad power supply, etc. But of course, once these checksum errors are flagged by ZFS/btrfs, it's a signal to test and fix/replace your hardware, not keep using a machine with bad hardware. And yes, while ZFS and btrfs cannot fix errors that happen before the checksumming takes place (e.g. due to bad RAM, bad CPUs, etc), they can still detect these kinds of errors (in some cases, at least), especially when they happen after checksumming already took place. And they definitely can detect and fix errors in the rest of the data-to-storage-and-back path (e.g. bad disk cables, bad disks or disk controllers, etc). |