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I own ten (10) compact flash cards. The cards are industrial high quality ones. Because of some random system crashes I checked all 10 cards using badblocks:

sudo badblocks -w -s -o badblocks-card1.log /dev/sdb

Badblocks reported for nine out of ten (9/10) hundreds of bad blocks. Does this really mean, that those nine cards should not be used anymore and need to be replaced? Or is there any protection layer in kernel (or on the card) which normally corrects those bad blocks and I do not have to care about them?

Is badblocks really that meaningful on compact flash cards?

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badblocks is meaningful on any storage device. It's a very simple program that just reads (and optionally writes) the entire disk, counting how many errors occurred while doing so.

You have apparently bought a bunch of bad ones. Use at your own risk.

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