Hello On all the disk volumes I have looked at, the format 4 DSCB field DS4DEVTK (device track length) has the value 58786. All the IBM documentation says that there are 56664 bytes in a track on a 3390 drive. At this link https://www.lascon.co.uk/hwd-3390-disks.php reference is made to 55996 usable bytes out of 56664 per track.
Is there some 'magic' formula that converts the value in DS4DEVTK to either 56664 or 55996, or should I just ignore DS4DEVTK? Thanks John ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [email protected] with the message: INFO IBM-MAIN
