WD3200bevt won't show in finder, but shows in Disk Utility

I have a western digital my passport 320GB 2.5" SATA drive. After being put up for a couple of months, it isn't mounting to my macbook. I bought a new USB cable to test if that was the issue and it still isn't working.

I ran the first aid in disk utility, but that didn't help me much:

"Verifying partition map for “WD 3200BEV External Media”

Checking prerequisites

Checking the partition list

Checking for an EFI system partition

Checking the EFI system partition’s size

Checking the EFI system partition’s file system

Checking all HFS data partition loader spaces

Checking Core Storage Physical Volume partitions

Checking storage system

Checking volume.

disk2s2: Scan for Volume Headers

disk2s2: Scan for Disk Labels

Logical Volume Group F3FA9EC9-AD3F-41D0-BE14-A2ACD4C63786 spans 1 device

Logical Volume Group has a 16 MB Metadata Volume with double redundancy

Start scanning metadata for a valid checkpoint

Load and verify Segment Headers

Load and verify Checkpoint Payload

Load and verify Transaction Segment

Load and verify Transaction Segment

Incorporate 1 newer non-checkpoint transactions

Load and verify Virtual Address Table

Load and verify Segment Usage Table

Load and verify Metadata Superblock

Load and verify Logical Volumes B-Trees

Logical Volume Group contains 1 Logical Volumes

Load and verify C6B2C4EC-0303-4889-B804-11E2C26ADDC8

Load and verify 209AAD8D-889E-4FA0-9268-2602DC9F18CB

Load and verify Freespace Summary

Load and verify Block Accounting

Load and verify Segment Cleaning

Newest transaction commit checkpoint is valid

The volume F3FA9EC9-AD3F-41D0-BE14-A2ACD4C63786 appears to be OK.

The partition map appears to be OK"

and then i ran another verify disk for the main partition:

"Verifying volume “DEREK”

Checking storage systemUnable to examine /dev/disk3: Resource busy

Error: Storage system verify or repair failed."