Hi Radoslaw,

In respect of:

"As I mentioned before, it is probably not a media error, because the tape can 
be read using BLP. It is single-file tape, so I can read three "BLP datasets": 
label, dataset, label."

I would no consider the ability to read a tape using BLP as proof that the tape 
is necessarily OK. The fact that the entire tape has been read simply means 
that the physical condition has not caused a problem it does not indicate that 
all the intended data blocks are present. I believe a previous poster alluded 
to this.

The object of having the block count in the EOF/EOV labels, as I understand it, 
is to allow a comparison between the number of blocks written (when the EOF/EOV 
is produced) and when the file is read. 

The question is without the block count how would missing data be detected?

When reading with BLP all the existing blocks may well be read, but are they 
all that should be there? If the answer is NO, and how can we tell, then the 
data set is logically corrupt.

>From a personal perspective whenever I have had a S237-04 in the past I have 
>always sought to have the tape recreated.

On the issue of "Hint: no user labels at EOF, only header."

It has been a long time since I either had an association with User labels or 
read the Tape Labels manual. The current Using Tapes manual (SC26-7412) whilst 
no explicit, implies that as both User Header and Trailer records are optional 
it is legitimate to have one set without the other, but that's only my 
interpretation.

Kind regards - Terry 

Terry Sambrooks
Director
KMS-IT Limited
228 Abbeydale Road South
Dore
Sheffield
S17 3LA
UK

Tel: +44 (0)114 262 0933
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www.legac-e.co.uk


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