The docker image is gone after the win7 system is rebooted

I installed dockertooolbox in the win7 system and loaded the docker image.
as soon as I shut down the win7 system and reopen the dockertoolbox,docker image, the image will disappear.
ask for an explanation!

Windows-7 docker
Jun.29,2022

docker container ls-a

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MySQL Query : SELECT * FROM `codeshelper`.`v9_news` WHERE status=99 AND catid='6' ORDER BY rand() LIMIT 5
MySQL Error : Disk full (/tmp/#sql-temptable-64f5-1e92628-471ab.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
MySQL Errno : 1021
Message : Disk full (/tmp/#sql-temptable-64f5-1e92628-471ab.MAI); waiting for someone to free some space... (errno: 28 "No space left on device")
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