diff --git a/lib/partition.js b/lib/partition.js
index <HASH>..<HASH> 100644
--- a/lib/partition.js
+++ b/lib/partition.js
@@ -23,8 +23,8 @@ Partition.prototype = {
   constructor: Partition,
   
   __OOB: function( lba ) {
-    return lba <= this.firstLBA ||
-      lba >= this.lastLBA
+    return lba < this.firstLBA ||
+      lba > this.lastLBA
   },
   
   get blockSize() {
Updated lib/partition: Fixed error in .__OOB()

Less/more than or equal should've just been less/more than.
No equal. NO EQUAL.