Hyperdeck Studio Pro Pro Res LT Data Rate

I have never used the LT setting on the hyperdeck studio pros, but I've just done a 1 minute test record on one of my decks... Total file size is 4GB!

AJA DataCalc calculates that 1 minute of ProRes 422 LT @ 1080i59.94 with 2 channels of audio should be less than 900MB!

Wondering if anyone else has experienced this and if perhaps someone from Blackmagic could comment on the discrepancy?

I do know that the Hyperdeck uses uncompressed PCM audio, where many iterations of ProRes422 use AAC audio. This should make the file significantly larger than you might think, however, I don't think those numbers would match up to the additional audio size. That is a much larger difference than you should get from the audio.