It's safe to delete the system reserved partition.
It's safe to delete the system reserved partition.
Sure, just to clarify, you're asking about removing the "system reserved" partition on your NTFS drive that came from a Windows 7 installation. It's safe to delete it if you're sure about it, since it won't affect your current Debian setup. Also, removing it should not remove the Windows boot entry from the GRUB menu. Just make sure you're comfortable with the change before proceeding.
It's 100mb on a 1tb storage... Do you really think it matters? I'm not sure, but I wouldn't stress about it unless I'm certain it's safe to erase it. Consider reinstalling grub to clear the boot entry.
It's likely stored in /boot directory. You may be able to skip it if needed.
It shouldn't be an issue if you're aware of it. You could simply delete the file and let grub-mkconfig process itself again. Alternatively, you might opt for a safer approach by deleting the entry from grub;P