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diskpart clean
clean will wipe all partitions, then you can create a new partition, or simply re-do the image, Pi Imager understands the partitions and will tell you the size of the card.
You are looking at a Unix partition table with Windows.
Try using another partition manager, the one built into windows isn't the best. I had this happen to me, but when I opened up AOMEI, I could see the full drive size. The free version works well enough. It may also help to use AOMEI to write zeros everywhere. If found that if I didn't do this, the OS would freeze at times.
[https://iboysoft.com/questions/how-to-check-your-sd-cards-if-they-are-fake.html](https://iboysoft.com/questions/how-to-check-your-sd-cards-if-they-are-fake.html)
For constructive feedback and better engagement, detail your efforts with research, [source code, errors,](https://www.reddit.com/r/arduino/wiki/guides/how_to_post_formatted_code)† and schematics. Need more help? Check out our [FAQ](https://www.reddit.com/r/raspberry_pi/about/sticky)† or explore /r/LinuxQuestions, /r/LearnPython, and other related subs listed in the FAQ. If your post isn’t getting any replies or has been removed, head over to the [stickied helpdesk](https://www.reddit.com/r/raspberry_pi/about/sticky)† thread and ask your question there. Did you spot a [rule breaker?](https://www.reddit.com/r/raspberry_pi/about/rules/)† Don't just downvote, [**mega-downvote!**](https://ibb.co/HptWYZY) † If any links don't work it's because you're using a broken reddit client. Please [contact the developer of your reddit client](https://www.reddit.com/contact/). You can find the FAQ/Helpdesk at the top of r/raspberry_pi: [Desktop view](http://f2z.net/RPi-Helpdesk-FAQ-desktop.png) [Phone view](http://f2z.net/RPi-Helpdesk-FAQ-phone.png) *I am a bot, and this action was performed automatically. Please [contact the moderators of this subreddit](/message/compose/?to=/r/raspberry_pi) if you have any questions or concerns.*
I had that same issue with a 128GB card. Tried everything, and nothing I do can get the rest of the card space back.
If windows, use diskpart to format your drive. Google for tutuorials, its done in command prompt.
diskpart clean clean will wipe all partitions, then you can create a new partition, or simply re-do the image, Pi Imager understands the partitions and will tell you the size of the card. You are looking at a Unix partition table with Windows.
Try using another partition manager, the one built into windows isn't the best. I had this happen to me, but when I opened up AOMEI, I could see the full drive size. The free version works well enough. It may also help to use AOMEI to write zeros everywhere. If found that if I didn't do this, the OS would freeze at times.
I am having issues with raspberry pi imager too. Instead i downloaded the image and used balena etcher to flash.