See the following for how to calculate a sector
https://www.ibm.com/support/knowledgecenter/en/SSB27H_6.2.0/fa2mr_sectval.html
Question 2: why 20 sectors at a minimum. It's a long answer.
We tend to think of a record as three unified parts, COUNT, KEY and DATA, but
really they are three mini-records (for lack of a better description). Each
part needs enough cells for the data, plus 9 cells of CRC and other control
information that we can never see.
So, for a COUNT field it takes 10 cells; for a KEY field, if present, and a
DATA field the calculation is:
SECTORS = 9 + (KL + (6 * KN) + 6) / 34)
Where KN = (KL + 6) / 232
KL = Key length
Change KL to DL and do the same calculation for the data area.
Question 3: Are you running under VM and using a mini-disk? VM formats their
R0 differently, I believe.
Hope this helps.
Chris Blaicher
Technical Architect
Mainframe Development
P: 201-930-8234 | M: 512-627-3803
E: cblaic...@syncsort.com
Syncsort Incorporated
2 Blue Hill Plaza #1563
Pearl River, NY 10965
www.syncsort.com
Data quality leader Trillium Software is now a part of Syncsort.
-----Original Message-----
From: IBM Mainframe Discussion List [mailto:IBM-MAIN@LISTSERV.UA.EDU] On Behalf
Of R.S.
Sent: Tuesday, January 23, 2018 7:15 AM
To: IBM-MAIN@LISTSERV.UA.EDU
Subject: Re: CKD details
Another set of questions:
1. What is sector???
3390 specification says it has 224 sectors per track (3380 had 222 sectors per
track).
I cannot find any explanation for that. Size of data cell is 34 bytes
2. In the 3390 reference I read the record can occupy 20 to 1729 data cells
(excluding standard R0).
Why 20? For 3390 device 20 cells is 680 bytes. Is it minimum for any record,
including i.e. very small Count plus 4 bytes of Data?
3. HA (Home Address)
I used File Manager to print it out and indeed it is 5-byte long, but it seems
to be NOT in format of CCHHR.
IMHO it is xCCHH, where x is one byte with x'00' (in my case), but it is first
byte.
Regards
--
Radoslaw Skorupka
Lodz, Poland
W dniu 2018-01-22 o 15:51, R.S. pisze:
> I'm looking for some reference describing track format of CKD disk.
>
> What I know is
> Index Point - Home Address - R0 - other Rn
>
> Some questions:
> 1. IP is just a "start of track", contains no data - Y/N ?
> 2. What is a format of HA?
> 3. What is a format of R0?
> 4. What is a format of Count field? How long is it? Is it 10 bytes?
> 5. What is maximum length of K and D?
>
> Any documentation?
>
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