Recording is a duty that modern CPUs are perfectly able to handle, even when processing multiple tracks at one time.

With modern CPUs we mean anything above 2.5 GHz dual core.

You’re not going to need a lot of RAM. With just 2 GB you’ll be able to easily operate in the most typical modern situations (recordings up to 20 channels).

If you want to be sure, especially regarding the chance of using your computer for multichannel recordings, 4 GB are a very good choice.

Modern SATA HDDs (Hard Drive Disks) are able to handle multi-track recordings up to an enormous amount of tracks.

There’s no need to buy specific gear such as 10.000 RPM HDDs or even SSDs.

Also, in terms of HDD capacity, it’s almost impossible to fill an 80 GB one in one session only.

To record, any OS that supports your audio card will do.

Even the legendary Windows XP.

PC fans are noisy: make sure that your computer doesn’t produce enough noise to alter recordings, or that you have the possibility of placing it in a room different from the recording one.

A closed door is enough to isolate the sound.

If by chance it’s going to be in the same room, make sure to place it at an adeguate distance from the microphones (you’re going to need some long cables for that).

It’s irrelevant.

Operative systems do not affect recording quality.

Actually, no software affects that. It only depends on the audio equipment.

Recordings do not admit errors: your computer should be rock solid.

Every error is going to be irreparable.

Only use a computer that you’re 101% sure about its software and hardware stability.

Choose it as if you were choosing medical equipment.