640GB USB 3.0 external hard disk drive available from £40

You can grab a 640GB hard disk drive from Ebuyer’s eBay outlet for as little as £39.99 including free delivery and, for a limited time only, 120 Nectar points worth 60p.

The drive, known as the Dashdrive CH11, is built by AData and is part of its Classic range. As a comparison, a similar AData drive, the NH01 Nobility, cost around £90 over two years ago.

It is a 2.5in model which means that it is USB-powered and is USB 3.0 compatible, with transfer rates hitting up to 90MBps. AData even includes an identification label, should you decide to buy one or more of these drives.

Other features include a three-year manufacturer warranty, a weight of 186g, a 2.1mm thickness and a few applications like HDD to Go, OS to Go and a 60-day trial to Norton Internet Security 2011.

Prices of hard disk drives are likely to depress even further in the medium to long term because of a number of factors.

The current economic climate, the widespread availability of free and cheap online cloud-based storage, and the rise of ultrabooks and other devices that use flash-based storage rather than magnetic hard drives are among the factors driving down the costs of hard disk drives.