diff --git a/src/utils/general.js b/src/utils/general.js
index 17abb49..79654ac 100644
--- a/src/utils/general.js
+++ b/src/utils/general.js
@@ -117,6 +117,10 @@ function stripWindowsDriveLetter(path) {
   return path.replace(/^[a-zA-Z]:/, "");
 }
 
+function hasWindowsDriveLetter(path) {
+  return /^[a-zA-Z]:/i.test(path);
+}
+
 /**
  * transition function to replicate `request` style requests using axios
  *
@@ -253,6 +257,7 @@ module.exports.lockKeysFromRequest = lockKeysFromRequest;
 module.exports.getLargestNumber = getLargestNumber;
 module.exports.stringify = stringify;
 module.exports.stripWindowsDriveLetter = stripWindowsDriveLetter;
+module.exports.hasWindowsDriveLetter = hasWindowsDriveLetter;
 module.exports.axios_request = axios_request;
 module.exports.default_supported_block_filesystems =
   default_supported_block_filesystems;
diff --git a/src/utils/windows.js b/src/utils/windows.js
index d2a969e..c02ceb3 100644
--- a/src/utils/windows.js
+++ b/src/utils/windows.js
@@ -1,5 +1,5 @@
-const { result } = require("lodash");
 const _ = require("lodash");
+const GeneralUtils = require("./general");
 const Powershell = require("./powershell").Powershell;
 
 /**
@@ -757,6 +757,16 @@ class Windows {
 
   async UnmountVolume(volumeId, path) {
     let command;
+
+    // this errors if it does not have a drive letter
+    if (!GeneralUtils.hasWindowsDriveLetter(path)) {
+      let item = await this.GetItem(path);
+      if (!item) {
+        return;
+      }
+      path = item.FullName;
+    }
+
     command = `Get-Volume -UniqueId \"${volumeId}\" | Get-Partition | Remove-PartitionAccessPath -AccessPath ${path}`;
 
     await this.ps.exec(command);