How do I responsibly dispose of backup tapes?

Our old tape drives have failed and we not using tapes for backup anymore. We still have a stack of DLT tapes with backups which may contain sensitive information like credit card numbers, social security numbers, etc.

How do I responsibly dispose of these backup tapes?

If I had a working drive I would be tempted to dd from /dev/urandom to the tape device, but the drives have failed. Would this be a good method if the drive was still working? What do you recommend I do with these tapes given that I have no working drive for them?

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