Let's examine the performance Seagate's new eSATA drive and see if it's as fast as it's purported to be. First, let's have a look at read access times.

Benchmark Results

Access Time

The red bar represents the new eSATA external drive attached to the Promise eSATA300 TX2 card included with the drive. For reference, we highlighted in blue the results obtained with a Seagate 500 GB SATA drive, which is what the eSATA external drive contains, only attached internally via the motherboard's SATA connector.

The result is a bit strange: we recorded a pretty large difference between the eSATA and its internal counterpart. In these access time tests, the eSATA was slowest of the group, even bested by USB and Firewire drives.

In theory, the eSATA should perform identically to the internal SATA drive if it were plugged in to one of the motherboard's internal SATA connectors, or an external SATA connector if it comes so equipped. Since the actual hard disks are identical, the difference we see between the two is probably a result of latency added with the Promise eSATA300 TX2 card, as opposed to the motherboard's onboard SATA controller.

Odd results indeed for what we expect to be a very high performance solution. Keep in mind, however, this test is for access time only. The really interesting numbers should appear in the read and write transfer tests.