Safe to delete Primary Partition on multi-boot Windows system?

I have 3 partitions on 1 disk set up as follows:

Win 7: System, Active, Primary Partition
Win 8: Boot, Page File, Crash Dump, Logical Drive
Win 10: Logical Drive

I want to delete Win 7 so I can just make it as a storage partition. Is it safe to do so, i.e. will I still be able to multiboot to Win 8 and Win 10?

Thanks!

PS. Added pic

Solution 1:

You are booting from the Windows 7 partition, which is the only primary partition. Therefore you can't delete it, as Windows cannot be started from a logical drive.

If you would like to reuse its disk-space, I suggest to boot to Windows 7 and use Disk Management to reduce the size of the partition as far as it will let you. Ensure that there is at least 1 GB of free space in the disk.

To add the resulting unallocated space to one of the following partitions, install a partition editor and move the other partition(s) on top of the unallocated space so it follows the partition. Then boot into this partition and use its Disk Management to resize it up.

Note that partition work is dangerous in case of an error, so take careful backups.