diff --git a/lib/drive/osx.coffee b/lib/drive/osx.coffee
index 2e317cf3..71ceea31 100644
--- a/lib/drive/osx.coffee
+++ b/lib/drive/osx.coffee
@@ -29,7 +29,7 @@ exports.list = (callback) ->
 
 			return {
 				device: "/dev/#{device}"
-				size: "#{size}#{sizeMeasure}"
+				size: "#{size} #{sizeMeasure}"
 				description: row.join(' ')
 			}
 
diff --git a/lib/drive/osx.spec.coffee b/lib/drive/osx.spec.coffee
new file mode 100644
index 00000000..4ba5f5a0
--- /dev/null
+++ b/lib/drive/osx.spec.coffee
@@ -0,0 +1,49 @@
+chai = require('chai')
+expect = chai.expect
+sinon = require('sinon')
+chai.use(require('sinon-chai'))
+childProcess = require('child_process')
+osx = require('./osx')
+
+describe 'Drive OSX:', ->
+
+	describe 'given correct output from diskdrive', ->
+
+		beforeEach ->
+			@childProcessStub = sinon.stub(childProcess, 'exec')
+			@childProcessStub.yields null, '''
+				/dev/disk0
+					 #:                       TYPE NAME                    SIZE       IDENTIFIER
+					 0:      GUID_partition_scheme                        *750.2 GB   disk0
+					 1:                        EFI EFI                     209.7 MB   disk0s1
+					 2:          Apple_CoreStorage                         749.3 GB   disk0s2
+					 3:                 Apple_Boot Recovery HD             650.0 MB   disk0s3
+				/dev/disk1
+					 #:                       TYPE NAME                    SIZE       IDENTIFIER
+					 0:                  Apple_HFS Macintosh HD           *748.9 GB   disk1
+																				 Logical Volume on disk0s2
+																				 3D74D961-80FB-4DB1-808F-8B5800C53E3A
+																				 Unlocked Encrypted
+			''', undefined
+
+		afterEach ->
+			@childProcessStub.restore()
+
+		it 'should extract the necessary information', (done) ->
+			osx.list (error, stdout) ->
+				expect(error).to.not.exist
+
+				expect(stdout).to.deep.equal [
+					{
+						device: '/dev/disk0'
+						description: 'GUID_partition_scheme'
+						size: '*750.2 GB'
+					}
+					{
+						device: '/dev/disk1'
+						description: 'Apple_HFS Macintosh HD'
+						size: '*748.9 GB'
+					}
+				]
+
+				return done()