dasdbi...@comcast.net (DASDBILL2) writes: > I know it has been "decades" since IBM manufactured its last real CKD > controller, but what was the exact date when the last new one was > shipped?
re: http://www.garlic.com/~lynn/2014g.html#82 Costs of core http://www.garlic.com/~lynn/2014g.html#83 Costs of core depends on how you differentiate CKD and FBA ... 3380 was already moving to fixed-block cells (track space calculations have 3380 rounding up to cell size). part of this is driven by increasingly sophisticated error correcting code technology being on fixed size blocks http://www.garlic.com/~lynn/2014g.html#75 non-IBM: SONY new tape storage - 185 Terabytes on a tape. fba-512 has been standard since the 70s with 3310s & 3370s ... but currently is move to fba-4096 ... as part of error correcting technology. http://en.wikipedia.org/wiki/Disk_sector the above has IBM sizes in 512, 1024, 2048, & 4096 in the 70s. The enhanced CMS filesystem introduced formating block size option ... but on 3310s & 3370s ... used multiples of 512byte physical blocks. however, industry standard transition to 4096 starting in 2007 continuing through Jan2011. IBM article on subject: http://www.ibm.com/developerworks/library/l-4kb-sector-disks/ -- virtualization experience starting Jan1968, online at home since Mar1970 ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to lists...@listserv.ua.edu with the message: INFO IBM-MAIN
