S3 actually uses a completely custom system[1] for writing bytes to disk. I haven't seen much in the way of details on the on-disk format but I certainly wouldn

S3 actually uses a completely custom system[1] for writing bytes to disk. I haven't seen much in the way of details on the on-disk format but I certainly wouldn't assume it resembles a normal filesystem. [1]: https://aws.amazon.com/blogs/storage/how-automated-reasoning-helps-us-innovate-at-s3-scale/ https://aws.amazon.com/blogs/storage/how-automated-reasoning...