Move Exchange database to new hard drive

I would almost guarentee low disk space is the problem. Just the transaction log files alone will probably eat up more than 25 MB on any given day.

The ONLY safe way to move Exchange databases is by using the Exchange Server Performance Optimizer. After you install, partition, and format your new drive, run the Optimizer. When Optimizer detects that there is more than 1 drive present (or if new drives have been added since the last time Optimizer was run), it will recommend where to placedatabases, transaction logs, and working files. You can accept the Optimizer recommendations for locations or set your own preference. Optimizer usually does a good job so I usually accept its recommendations.

As for how long it will take, thats hard to say not knowing your system. If you want an approximate time, try moving 4 GB of data from one drive to another (as a test). The time will be shorter moving from one physical drive to another than it would be moving from one partition to another on the same drive. There is also a time difference in moving data vs. copying data because moving actually encompasses 2 operations: copying to new location and deleting from old location.

Oh, as always, make sure you have a GOOD backupof your installation before attempting something of this magnitude, as nothing is foolproof.

Good luck.