Problem about the capacity of sandisk extreme pro flash drive (512 GB)

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Hi there. I have recently bought a sandisk extreme pro solid state flash drive with 512 GB capacity. After formatting with both NTFS and exFAT, I noticed that the usable capacity is 460 GB. It seems something is wrong, because it should be approximately 476 GB. I searched all over the internet and did not find any satisfactory explanation.

Please consider before replying:

  1. I know the difference between GB and GiB. This is exactly why I mentioned that it should show 476. 460 is way too low and cannot be attributed to GiB conversion.

  2. I checked with diskpart and other tools and there are no additional/hidden partitions. Plus, I deleted the included software before formatting.

Thanks in advance!