# mne\_process\_raw

**URL:** <https://mne.discourse.group/t/mne-process-raw/493>\
**Category:** Mailing List Archive (read-only)\
**Tags:** list-archive\
**Created:** [September 21, 2012, 8:48pm UTC](https://mne.discourse.group/t/mne-process-raw/493 "2012-09-21T20:48:55Z")\
**Posts on this page:** 2\
**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:** [September 21, 2012, 8:48pm UTC](https://mne.discourse.group/t/mne-process-raw/493/1 "2012-09-21T20:48:55Z")

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Hi group,

My group went into the MEG lab yesterday to define and save our scanning settings onto the new MEG console per Matti's instructions. We performed a practice round in which we were successfully able to record one of our blocks. Today, when I attempted to extract the events from the raw fif file I received an error: "could not read tag directory!" Here is where the problem occurred:

mne\_process\_raw version 2.35 compiled at Sep 21 2012 04:22:13  
64-bit architecture. Using 600.00 Mbytes for ring buffers

--- Setting up the filter ---

Using a 4096-point FFT in filtering of raw data with 2048-sample tapers  
bandpass = 0.0 ( 0.0) ... 40.0 ( 5.0) Hz  
filter is on

--- Opening /autofs/space/.../TestForMEG\_B5\_raw.fif ---

Could not read tag directory!

And this is what appeared in our history log:

meg\_extractevents TestForMEG ssStart 0.528 mne\_process\_raw --raw /autofs/space/.../TestForMEG\_B5\_raw.fif --eventsout /autofs/space/.../TestForMEG\_B5.eve -projon

Does anyone know what the "could not read tag directory!" error means and how to fix this problem?

Thanks in advance!

-Reid  
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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:** [September 21, 2012, 8:56pm UTC](https://mne.discourse.group/t/mne-process-raw/493/2 "2012-09-21T20:56:31Z")

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Hi Reid,

Did you save the file in megacq's local data area? If so, the file should be on /space/megraid/96/MEG now. The error you received usually means that the file was broken in the copying process, most frequently because you ran out on the destination volume and did not notice it. If you can point me to the original, I can have a look.

- Matti