diff --git a/src/apps/drivesetup/CreateParamsPanel.cpp b/src/apps/drivesetup/CreateParamsPanel.cpp
index 0ac94be003..ce9b8f0d41 100644
--- a/src/apps/drivesetup/CreateParamsPanel.cpp
+++ b/src/apps/drivesetup/CreateParamsPanel.cpp
@@ -162,7 +162,8 @@ CreateParamsPanel::Go(off_t& offset, off_t& size, BString& type)
 			type << _type;
 		}
 		// Return the value back as bytes.
-		size = (off_t)fSizeSlider->Value() * kMegaByte;
+		size = (off_t)fSizeSlider->Size() * kMegaByte;
+		offset = (off_t)fSizeSlider->Offset() * kMegaByte;
 	}
 
 	int32 value = fReturnValue;
@@ -196,7 +197,7 @@ CreateParamsPanel::_CreateViewControls(off_t offset, off_t size)
 	fTypeMenuField = new BMenuField("Partition Type", fTypePopUpMenu, NULL);
 
 	fSizeSlider = new SizeSlider("Slider", "Partition Size", NULL, offset,
-		size);
+		offset + size);
 	fSizeSlider->SetPosition(1.0);
 
 	fOKButton = new BButton("Create", new BMessage(MSG_OK));
diff --git a/src/apps/drivesetup/Support.cpp b/src/apps/drivesetup/Support.cpp
index 87357a9712..cbe7d6185e 100644
--- a/src/apps/drivesetup/Support.cpp
+++ b/src/apps/drivesetup/Support.cpp
@@ -115,18 +115,16 @@ SpaceIDMap::SpaceIDFor(partition_id parentID, off_t spaceOffset)
 
 SizeSlider::SizeSlider(const char* name, const char* label,
 	BMessage* message, int32 minValue, int32 maxValue)
-	: BSlider(name, label, message, minValue, maxValue, B_HORIZONTAL,
-		B_TRIANGLE_THUMB),
-	fOffset(minValue),
-	fSize(maxValue)
+	: BSlider(name, label, message, minValue, maxValue,
+	B_HORIZONTAL, B_TRIANGLE_THUMB),
+	fStartOffset(minValue),
+	fEndOffset(maxValue)
 {
 	SetBarColor((rgb_color){ 0, 80, 255, 255 });
-	BString offset, size;
-	offset << fOffset;
-	offset << " MB";
-	size << fSize;
-	size << " MB";
-	SetLimitLabels(offset.String(), size.String());
+	BString startOffset, endOffset;
+	startOffset << "Offset: " << fStartOffset << " MB";
+	endOffset << "End: " << fEndOffset << " MB";
+	SetLimitLabels(startOffset.String(), endOffset.String());
 }
 
 
@@ -139,8 +137,24 @@ const char*
 SizeSlider::UpdateText() const
 {
 	fStatusLabel.Truncate(0);
-	fStatusLabel << Value();
+	fStatusLabel << Value() - fStartOffset;
 	fStatusLabel << " MB";
 
 	return fStatusLabel.String();
 }
+
+
+int32
+SizeSlider::Size()
+{
+	return Value() - fStartOffset;
+}
+
+
+int32
+SizeSlider::Offset()
+{
+	// TODO: This should be the changed offset once a double
+	// headed slider is implemented.
+	return fStartOffset;
+}
diff --git a/src/apps/drivesetup/Support.h b/src/apps/drivesetup/Support.h
index adf7287d9f..18579d230c 100644
--- a/src/apps/drivesetup/Support.h
+++ b/src/apps/drivesetup/Support.h
@@ -28,7 +28,7 @@ enum {
 };
 
 
-static const uint32 kMegaByte = 1048576;
+static const uint32 kMegaByte = 0x100000;
 
 class SpaceIDMap : public HashMap<HashString, partition_id> {
 public:
@@ -50,10 +50,12 @@ public:
 	virtual						~SizeSlider();
 
 	virtual const char*			UpdateText() const;
+			int32				Size();
+			int32				Offset();
 
 private:
-			off_t				fOffset;
-			off_t				fSize;
+			off_t				fStartOffset;
+			off_t				fEndOffset;
 	mutable	BString				fStatusLabel;
 };