I have heard about 2 more very different sound libraries recently. The first is a detailed almost forensic library of computer hard drives sounds from New Sound Lab and the second is a library of factory machine sounds in real factories. from Sonic Salute.

New Sound Lab – Hard Drives

This library features recordings of four hard disk drives (3.5 inch - 5400 & 7200 RPM). All essential hard drive sounds are included (boot up, read/write/copy/delete, power down) that will work great for general computer sounds and ambience. 

Additionally, each hard drive was opened up, manipulated, and ultimately destroyed to create a collection of raw, abstract and unique sounds. Found materials such as metal, cardboard, plastic, and tools were used to control the hard drive’s motor, platter, and head actuator. These sounds work especially well for creating the sounds of mechanical robot movements, electric motors, and futuristic machinery.

• 80 Broadcast Wave files at 24bit - 192khz (mono)

• Library size is 1.8GB

• Price $30.00

Sonic Salute: Factory Machinery Ambiences

Sounds range from plastic foundries, casting machines, and machinery alarms, to giant textile processing units, and medical equipment manufacturing, cleanrooms and robotics. All very loud environments. All recordings are several minutes long. 2 out of 4 factories, allowed for a handful of pictures to be taken. Info on the process and specific machinery type, was unfortunately not allowed to be written down or  otherwise archived due to industrial copyrights, and patents. Copying by competing companies is apparently a big problem.

Factory Machinery Ambiences by gimaudio

• 65 stereo tracks. 96Khz 24 bit.

• 4 GB, ZIP download.

• All tracks named and Metadata tagged.

• Price $25.00