# Error writing MRML and MRB files on mapped drive

**URL:** <https://discourse.slicer.org/t/error-writing-mrml-and-mrb-files-on-mapped-drive/43029>\
**Category:** Support\
**Tags:** mrml\
**Created:** [May 21, 2025, 9:44pm UTC](https://discourse.slicer.org/t/error-writing-mrml-and-mrb-files-on-mapped-drive/43029 "2025-05-21T21:44:48Z")\
**Posts on this page:** 2\
**Page:** 1

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**Author:** ![ezgimercan](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/ezgimercan/32/4584_2.png) [@ezgimercan](https://discourse.slicer.org/u/ezgimercan)\
**Post date:** [May 21, 2025, 9:44pm UTC](https://discourse.slicer.org/t/error-writing-mrml-and-mrb-files-on-mapped-drive/43029/1 "2025-05-21T21:44:48Z")

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I am using latest stable, 5.8.1 on Ubuntu 22.04. I have some research drives mounted with autofs (nfs). Slicer complains that the locations is not writable when I try to save MRB or MRML files. I can save/write/export everything else successfully.  
I assume that the writers for these formats are Slicer specific. Any ideas why they fail where others do not?

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**Author:** ![muratmaga](https://sea2.discourse-cdn.com/flex002/user_avatar/discourse.slicer.org/muratmaga/32/3622_2.png) [@muratmaga](https://discourse.slicer.org/u/muratmaga)\
**Post date:** [May 22, 2025, 3:54pm UTC](https://discourse.slicer.org/t/error-writing-mrml-and-mrb-files-on-mapped-drive/43029/2 "2025-05-22T15:54:08Z")

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Not sure why that might be the case, but MRB will require a a subfolder to be created within the location you specified (so that it can zip things). Perhaps you have a strange permission that allows you to write files but not create folders?

In general you should avoid creating MRBs over a network connection since it will be slower. I suggest doing locally at a location like /tmp and then moving to your network location where you will like to share/store long term.