This crate can parse GPT and basic MBR partition tables.

Documentation and Examples

https://docs.rs/bootsector

Limitations

• MBR extended partitions are not read (although they are returned, so you could read them yourself). This should be implemented.
• GPT backup tables are not validated, which is "kinda" required by the spec. This could be implemented, but isn't super important, unless you're doing data recovery.
• Sector sizes apart from 512 bytes are not well tested. These devices don't seem to exist as of 2017.