# .ulg file maximum size?

**URL:** <https://discuss.px4.io/t/ulg-file-maximum-size/29081>\
**Category:** PX4 Autopilot\
**Created:** [September 19, 2022, 11:38am UTC](https://discuss.px4.io/t/ulg-file-maximum-size/29081 "2022-09-19T11:38:26Z")\
**Posts on this page:** 1\
**Showing post:** 2

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**Author:** ![bkueng](https://discuss.px4.io/letter_avatar_proxy/v4/letter/b/2bfe46/32.png) [@bkueng](https://discuss.px4.io/u/bkueng)\
**Post date:** [September 19, 2022, 4:25pm UTC](https://discuss.px4.io/t/ulg-file-maximum-size/29081/2 "2022-09-19T16:25:21Z")

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Hi

The 5.5h with 2GB file means 101KB/s logging rate. Is this with the default profile? I expect it to be around 40KB/s.  
The maximum file size depends on the file system and OS, and the 2GB is apparently the size limit on NuttX, although it could go to 4GB.

Generally for this long flight hours we should further reduce the logging rate, as we don’t need high-rate sensor data.

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