On 23 January 2018 at 10:22, R.S. <[email protected]> wrote: > Fortunately your explanation was clear enough to find out each "mini-record" > has at least 10 cells (9 control plus a t least one for data). > > However you used word "SECTORS". I used "34-byte DATA CELL", following the > 3390 documentation (other names can be found elsewhere). > It seems the documentation use SECTOR for something else. The SA22-1025-00 > says the 3390 device has 224 sectors per track and 222 for 3380. So, the > SECTOR cannot be the same as DATA CELL. > > I have no idea what is the SECTOR.
I assume it is the value used in the Set Sector/Read Sector CCWs. This came with the 3330 (real "analogue" disk) and is part of Rotational Position Sensing (RPS). It should have no logical relationship to the cell size; it's just a logical position (degrees, radians, IBM magic numbers because degrees and radians were NIH...?) on the track. Tony H. ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
