XFS Zeroes the block instead of keeping the random/sensitive data that was already on the disk if the metadata necessary for that write was not commited before

XFS Zeroes the block instead of keeping the random/sensitive data that was already on the disk if the metadata necessary for that write was not commited before the failure. Ext leaves the data as is. If you want full protection against those situations instead of praying that it's still the right data or that it doesn't happen at all, you need a copy-on-write FS, or enable data=journal on ext3, at a massive performance cost.