MyService (http://www.myservice.com) has announced a new 3TB hard drive upgrade for the iMac and Mac Pro. These new 3.5-inch drives by Hitachi are the largest desktop drives available. The upgrades cost US$299, plus shipping.

MyService has these drives in stock. The upgrade service includes the new drive, professional installation and data transfer. Most hard drive upgrades are completed the same day. After the service is complete, your Mac is cleaned, tested and returned to you, along with your old drive. Since MyService is an Apple Authorized Service Provider, the 3TB upgrade won’t void your Apple warranty.

The Hitachi Deskstar 7K3000 3TB hard drive comes with 7200RPM performance, a 64MB data buffer and uses the new 6Gb/s SATA interface. This configuration shows an improvement of up to 27% over previous generation products, according to the folks at MyService.