Sounds good.

The old hard disk that failed the short test will be your problem with that TiVo so a new hard disk will fix it.

The other hard disk that passed the short test may be OK and glad to hear it is working, but if you have any further issues then my advice would be to run the full test as it does not take too long and tests all sectors on the hard disk. TiVo's don't like hard disks with any surface errors.