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#2031
When you connect a random disk to the machine, whether it be internal or external, providing that disk has already been allocated, Windows will assign it either the drive letter that it has already been assigned, or the next available unused letter; this is fine if you don't later need a path to be remembered.
If you want to assign a particular drive letter to that disk that will remain with it no matter how many times you disconnect and reconnect, in Disk Management, click on (select) the partition you desire to assign the letter to; right-click and choose "Change drive letter and path"; click "change"; choose your drive lettter from the flyout menu; you should then see that drive letter in the partition label.
While you are at it, right-click again and choose "Properties"; the name associated with that drive will be in an editable space; replace that name with one that makes sense to you, such as Mike's Pictures or Mike's Music, etc.
If I have missed a step or anything, someone please correct me, as I don't want to mislead anyone.
Let me add this: a disk can contain several partitions and each of these partitions is considered a Drive with it's own drive letter; if a disk only has a single partition, it will only have the single drive letter.
If a disk has multiple partitions/drives, you can change any single one of the drive letters and it not have any effect on the others.
Also, if you connect a disk with assigned letter(s) and those letters are already in use, the next available letter(s) will temporarily be assigned.