Google has made a 'stable' build of its Chrome OS available.

The OS has currently only been released to a number of beta testers in the US via a laptop dubbed the Cr-48. The laptop has a 12.1 inch display, a regular-sized keyboard, and a battery that will last for eight hours.

Google's system boots up in 60 seconds; after it goes to sleep, it can resume operations nearly instantly; it encrypts all data automatically; and it uses a piece of encryption hardware called a trusted computing module to digitally sign components of the operating system and check them for tampering.

The search engine has never revealed if or when it will sell its own lightweight laptops with the OS, but has confirmed commercially available Chrome OS netbooks will be sold by Acer and Samsung sometime this year.

Google is set to host the I/O conference in the US next month and many tech enthusiasts expect the search engine to make an announcement regarding the OS at the event.