Can I delete my PC's manufacturer pre-installed partitions

Jan 26, 2019
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My PC came with few pre-installed partition on disk(only one disk).I did clean Windows 10 reinstall a few times but I never touched them and I want to know if i can safely delete them. I also want to know if I can delete windows recovery partition because Iam always doing my reinstall from bootable flashdrive.
 
Jan 26, 2019
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TOSHIBA EXT is my external drive

 
Jan 26, 2019
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Even when I'am doing a clean reinstall of Windows?