-----Original Message----- From: cctalk [mailto:cctalk-bounces at classiccmp.org] On Behalf Of Noel Chiappa via cctalk Sent: Friday, December 07, 2018 10:24 AM To: cctalk at classiccmp.org Cc: jnc at mercury.lcs.mit.edu Subject: Re: Opening RL02 disk pack invent Huh? I thought RL0x drives use an IBM 5440 type pack (as used on the IBM System/3 - I used one of those at my first computer job, they'd just gotten it in); DEC may have used their own format (and servo track stuff), I don't know much about the 5440. Noel ---- Quoted from "DISK DRIVE CONTROL: THE EARLY YEARS" (Abramovitch & Franklin) https://www.researchgate.net/publication/3206778_A_brief_history_of_disk_dri ve_control "DEC came out with the 125 TPI RL01 disk drive in 1978,which was the first mass produced full sectored (embedded) servo drive on the market." Sounds to me like it was different, but in a good way? paul

On Fri, 7 Dec 2018, Noel Chiappa wrote: Yes, I mean the mechanism of the handle that is different, not the entire pack. Christian