Nowadays, album recordings are mostly carried out with digital equipment, as opposed to analog tape recorders in the old days. Digital equipment makes life easier for sound recording engineers. Audio is usually transferred to or recorded on hard drives. A fast hard drive is a must. It's also possible to create an mp3 out of your digital recordings. An easy way of transferring these mp3s is with USB sticks. USB sticks are not that expensive anymore nowadays. Storage spaces of 1 GB or 2 GB are not unusual. There are even fancy sushi USB sticks available. Read more about this on Sushi USB sticks on the gadgets and women tech blog.