This questions comes up with users of Volumes every once in a while:
Users will create a Volume and choose to auto format it and when ssh-ing into their droplet they’ll see the volume as 380MB.
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If you added a volume and it only shows 380MB in size, expand your partition like in this how-to guide How to Expand Partitions After Resizing a Volume
Also, please report the error to support by opening a ticket here and share your /var/log/syslog files