# Hashstore Migration Guide

**URL:** <https://forum.storj.io/t/hashstore-migration-guide/30658>\
**Category:** getting started\
**Tags:** hashstore\
**Created:** [September 1, 2025, 11:10am UTC](https://forum.storj.io/t/hashstore-migration-guide/30658 "2025-09-01T11:10:57Z")\
**Posts on this page:** 1\
**Showing post:** 24

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**Author:** ![Alexey](https://storj.bcdn.literatehosting.com/user_avatar/forum.storj.io/alexey/32/41_2.png) [@Alexey](https://forum.storj.io/u/Alexey)\
**Post date:** [September 20, 2025, 2:57am UTC](https://forum.storj.io/t/hashstore-migration-guide/30658/24 "2025-09-20T02:57:00Z")

</div>

Perhaps it was corrupted. If you have logs, you may search for this piece.  
To reconstruct a PieceID you can use this method:

> [@ERROR collector unable to delete piece](https://forum.storj.io/t/topic/12916/11):
>
> Each satellite has their own folder in the blobs folder in your storage location. For the satellite this piece is on that’s v4weeab67sbgvnbwd5z7tweqsqqun7qox2agpbxy44mqqaaaaaaa. The subfolders you see inside there represent the first 2 characters of the piece id. So in your case the folder should be fr. The filename inside that folder is the rest of the piece id with a .sj1 extension. So jgxef52maxhcihttdsbjsez6vpmdqqw6l7zxp2jykasd37pusq.sj1. Path and filenames are in lower case, which is a litt…

But in reverse direction. Then you can search for this PieceID in your logs to see maybe it caused an exception during migration.

Also, what’s size of this piece?

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