# Split file saving doesn't work

**URL:** <https://mne.discourse.group/t/split-file-saving-doesnt-work/2184>\
**Category:** Mailing List Archive (read-only)\
**Tags:** list-archive\
**Created:** [May 6, 2020, 12:12pm UTC](https://mne.discourse.group/t/split-file-saving-doesnt-work/2184 "2020-05-06T12:12:47Z")\
**Posts on this page:** 6\
**Page:** 1

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**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\
**Post date:** [May 6, 2020, 12:12pm UTC](https://mne.discourse.group/t/split-file-saving-doesnt-work/2184/1 "2020-05-06T12:12:47Z")

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Dear list

Every now and then I cannot save my epochs objects due to this error.  
This happens only for one of my subjects (out of thirty) and only on one  
particular (bandpass filtered and hilbert transformed) raw file. I have  
tried both the development version and newest stable version.

I guess it should take care of it automatically as I didn't change the  
default split size of 2GB of epochs\_hilbert.save()

All the best

Lau

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**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\
**Post date:** [May 6, 2020, 12:50pm UTC](https://mne.discourse.group/t/split-file-saving-doesnt-work/2184/2 "2020-05-06T12:50:40Z")

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hi Lau,

please open an issue and make the file available.

you can save it in .h5 format so we can debug the fif IO

Alex

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**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\
**Post date:** [May 6, 2020, 3:17pm UTC](https://mne.discourse.group/t/split-file-saving-doesnt-work/2184/3 "2020-05-06T15:17:41Z")

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I suspect I understand why this can happen from the code -- we calculate  
the splits using just the size of the actual data, but end up writing that  
plus other things (drop log, metadata, etc.) which can push it beyond the  
2GB limit. For now you can do something like `split_size='1.9GB'` to work  
around the problem, but hopefully we can cook up a proper fix for it soon.

Eric

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**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\
**Post date:** [May 7, 2020, 7:07am UTC](https://mne.discourse.group/t/split-file-saving-doesnt-work/2184/4 "2020-05-07T07:07:18Z")

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Hi Eric

That actually make the trick, so it is likely it is as you describe.  
Thanks a lot for your suggestion!

@Alex: are you still interested in having an anonymous copy of the file?

All the best

Lau

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**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\
**Post date:** [May 7, 2020, 7:13am UTC](https://mne.discourse.group/t/split-file-saving-doesnt-work/2184/5 "2020-05-07T07:13:58Z")

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> @Alex: are you still interested in having an anonymous copy of the file?

no need. Just confirm that the fix from Eric

> <https://github.com/mne-tools/mne-python/pull/7740>
>
> From the mailing list.

does the job.

Alex

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**Author:** ![system](https://global.discourse-cdn.com/free1/uploads/mne/original/1X/85cc6bd2b69cb698a166dc6d880fb550510d0144.jpeg) [@system](https://mne.discourse.group/u/system)\
**Post date:** [May 7, 2020, 3:28pm UTC](https://mne.discourse.group/t/split-file-saving-doesnt-work/2184/6 "2020-05-07T15:28:15Z")

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it indeed fixed my issue - thanks for your quick response!