<html><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8"></head><body >Bad blocks<br><br><br>-------- Original message --------<br>From Rob Doyle <radioengr@gmail.com> <br>Date: 04/12/2015 11:07 PM (GMT-07:00) <br>To simh@trailing-edge.com <br>Subject [Simh] PDP-10/RP06 Disk Image Size <br> <br><br>I'm designing an RH11 disk controller for my KS10 FPGA. I'd like to<br>use the SIMH data format for the media.<br><br>I noticed that an RP06 disk image from SIMH is 315,187,200 bytes.<br><br>Assuming an RP06 has 815 cylinders, 19 heads, 20 sectors (confirmed<br>in SIMH code) - I calculate that disk image should be 317,132,800<br>bytes.<br><br>If use 810 cylinders (instead of 815), I get the size of the of the<br>image file.<br><br>SIMH doesn't pack data: there are 128 words per sector and each<br>word occupies 64-bits or 8 bytes. Therefore a sector is 1024 bytes.<br><br>What's am I missing?<br><br>Rob<br><br>--<br>KS10 FPGA Project at: http://www.techtravels.org/KS10FPGA/<br>_______________________________________________<br>Simh mailing list<br>Simh@trailing-edge.com<br>http://mailman.trailing-edge.com/mailman/listinfo/simh</body>