# Change derivation of PoSpace seed (and HDD-compatible exploit)

**URL:** <https://forum.autonomys.xyz/t/change-derivation-of-pospace-seed-and-hdd-compatible-exploit/4438>\
**Category:** Research\
**Tags:** research, consensus, farming, plotting\
**Created:** [September 25, 2024, 3:12am UTC](https://forum.autonomys.xyz/t/change-derivation-of-pospace-seed-and-hdd-compatible-exploit/4438 "2024-09-25T03:12:32Z")\
**Posts on this page:** 1\
**Showing post:** 5

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**Author:** ![Barak](https://avatars.discourse-cdn.com/v4/letter/b/dbc845/32.png) [@Barak](https://forum.autonomys.xyz/u/Barak)\
**Post date:** [September 27, 2024, 8:54am UTC](https://forum.autonomys.xyz/t/change-derivation-of-pospace-seed-and-hdd-compatible-exploit/4438/5 "2024-09-27T08:54:45Z")

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Nazar, please see [Usage of total\_pieces](https://forum.autonomys.xyz/t/usage-of-total-pieces/1185). I believe that this was the reason to include `history_size` (back then called `total_pieces`) in the evaluation seed of the PoS table.  
It seems to me that we can move it into `sector_id` instead, however the moral is that we should be careful about moving it from one place to another.

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