Help needed. Vista 32 window explorer cannot recongise all 3TB. But Disk managment can

Bought a 3TB WD green drive. Manage to partition to 2x 1.5TB in GPT partition - and used both parition as storage. However, had a problem now. Disk managment can see all the two parition but window explorer cannot access the second partition. What has happened?

p.s. i already had data in my 2nd partition thus i dont wish to format it.

Try assigning a different drive letter for the partition that is not seen

i cannot assign the drive coz the drive is not accesible …

anyone can help me with my problem ? Thx

On the subject you stated that disk management shows the drive

what do you mean the drive is not accessible?

disk managment show the drive , but OS cannot access.