Not by using the native Windows functionality. If both partitions contain data and you want to merge them without losing data, you'll need to use third-party partition management software.
You can try the following:
- EaseUS Partition Master (free and paid versions available)
- MiniTool Partition Wizard (free and paid versions available)
- AOMEI Partition Assistant (free and paid versions available)
Note that both partitions must use the same file system (e.g., NTFS). If not, the tool may prompt you to convert them.
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hth
Marcin