Before I shred a NTFS disk with Ubuntu, can I count on shred to overwrite all data? Perhaps there is a better question to ask: please feel free to add additional questions that serve to trigger discussion regarding shred limits on NTFS disks.
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shred was intended to overwrite files. I'm not convinced that you could make it actually overwrite every block of your disk.
What don't you use DBAN instead? DBAN is free and is intended to overwrite the entire disk, regardless of file system.
If your disk is a SSD, you should know that it's difficult to securely delete all of the contents.. Here's an older article that begins explaining why.
Oh and if you prefer to stick with Unix command line tools, dd could accomplish what you're looking for. Eg:
dd if=/dev/zero of=/dev/sdb
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