PerSci delivers the Dual-Headed Diskette Drive

Peripheral Sciences - or PerSci - with its dual-headed dual-floppy unit, was going up against companies like Shugart which had just introduced the 5¼" floppy. 

Ignoring their size, these huge 8" drives still had some advantages as they were capable of storing a total of 3.2Mb, in an era when the very first "Winchester" hard drives could generally store only 5 or 10Mb. 

They were also IBM compatible, but not in the sense of the PC, which wouldn't be launched for another 3 years, but in terms of IBM's 3740 media devices. 

It's a nice advert showing hundreds of the drive units on a production line, at a time when it was still common to advertise just a floppy unit which often cost more than the computer it was attached to - about $1,000 in 1977, or [[666|1977]] in [[now]] terms. The price of floppy drives had dropped to around £5 for a 1.44Mb 3½" floppy by 2001.