# concatenate\_raws produces EDFs files with no output **URL:** \ **Category:** Support & Discussions\ **Tags:** eeg\ **Created:** [February 21, 2024, 1:12am UTC](https://mne.discourse.group/t/concatenate-raws-produces-edfs-files-with-no-output/8372 "2024-02-21T01:12:32Z")\ **Posts on this page:** 3\ **Page:** 2
**Author:** ![cbrnr](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/cbrnr/32/1409_2.png) [@cbrnr](https://mne.discourse.group/u/cbrnr)\ **Post date:** [May 13, 2024, 9:22am UTC](https://mne.discourse.group/t/concatenate-raws-produces-edfs-files-with-no-output/8372/22 "2024-05-13T09:22:11Z")
There are a lot of things going on, let’s try to narrow down the issue a bit. 1. MNE 1.7.0 has been released, can you please upgrade and see if the problem still persists? 2. Does the export error also occur with just a single file or only after concatenation? 3. The number -69964600 might be a digital value and not a physical value, which is why you cannot find it in your data. 4. Can you show the output of `raw.describe()` (where `raw` is the raw data immediately prior to export)? ---
**Author:** ![rzhao](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/rzhao/32/3459_2.png) [@rzhao](https://mne.discourse.group/u/rzhao)\ **Post date:** [May 14, 2024, 4:26pm UTC](https://mne.discourse.group/t/concatenate-raws-produces-edfs-files-with-no-output/8372/23 "2024-05-14T16:26:37Z")
I am in the process of trying out your provided steps, but for the time being I was just wondering if you can help me understand what these digital values are? ---
**Author:** ![cbrnr](https://yyz2.discourse-cdn.com/free1/user_avatar/mne.discourse.group/cbrnr/32/1409_2.png) [@cbrnr](https://mne.discourse.group/u/cbrnr)\ **Post date:** [May 14, 2024, 5:54pm UTC](https://mne.discourse.group/t/concatenate-raws-produces-edfs-files-with-no-output/8372/24 "2024-05-14T17:54:26Z")
EDF encodes data as 16bit integers, which are mapped to physical values. I am not entirely sure, but I assume that the value -69964600 is a digital value, but without seeing the data it’s difficult to tell. [Previous page](https://mne.discourse.group/t/concatenate-raws-produces-edfs-files-with-no-output/8372.md?page=1)