is there a chance that malware will affect my windows partitions?

Question

My question is : Same I dismount? affect my windows partitions? Sorry my english grammar

Answer 1

Yes

Some malware can delete or encrypt/ransom your entire system -- all partitions, including Windows, Ubuntu, and others.

It's unlikely that a virus will try to mount Windows partitions and infect your Windows install. There are several layers of protection to prevent that kind of intrusion, and the number of dual-boot systems is a bit low to justify such effort. Such malware is possible, but has not been seen in the wild.

Use good security habits, including proper backups and good reinstallation notes, to avoid becoming a very frustrated victim.