Huh?  Methinks you replied to the wrong comment.  😉

-----Original Message-----
From: IBM Mainframe Discussion List <[email protected]> On Behalf Of 
Steve Beaver
Sent: Thursday, December 18, 2025 4:28 PM
To: [email protected]
Subject: Re: [EXTERNAL] Re: Grrr! Yes, TSO TRANSMIT destroys PDSes (Rant)

Lionel has given you a solution that works and I have you an alternative 
solution 



Sent from my iPhone

No one said I could type with one thumb 

> On Dec 18, 2025, at 16:24, Pommier, Rex 
> <[email protected]> wrote:
> 
> Understood, but the 3350 hasn't been available for over 30 years, and 
> the 3390 format has been available for almost 30 years.  I would think 
> the "prevailing mentality" could have changed in those 30 years.  Not 
> worth quibbling about, but it just strikes me as odd that even with 
> SDB available for - I don't know how long - but with 3390 format being 
> the standard for almost 30 years, I'm still seeing things show up from 
> vendors defaulting to 3120 or 6160 block sizes for FB/80 and around 
> 4-6K for load library blocks.  Inertia is a great force!  LOL
> 
> Rex
> 
> -----Original Message-----
> From: IBM Mainframe Discussion List <[email protected]> On 
> Behalf Of salva
> Sent: Thursday, December 18, 2025 4:03 PM
> To: [email protected]
> Subject: Re: [EXTERNAL] Re: Grrr! Yes, TSO TRANSMIT destroys PDSes 
> (Rant)
> 
> 6160 was the best fit for 3350 (97%) with small buffer size.
> 
> El jue, 18 dic 2025, 22:45, Pommier, Rex < 
> [email protected]> escribió:
> 
>> One thing I've never understood.  Why 6160 for a FB/80 sequential 
>> dataset?
>> 
>> A FB/6160 has 8 blk per track = 49200 bytes of 56664 = 86.9%
>> 
>> But bumping it to FB/80/6480 yields
>> 
>> 8 blocks per track, 51840 bytes per block, 91.5% utilization.
>> 
>> Rex
>> 
>> -----Original Message-----
>> From: IBM Mainframe Discussion List <[email protected]> On 
>> Behalf Of salva
>> Sent: Thursday, December 18, 2025 3:28 PM
>> To: [email protected]
>> Subject: [EXTERNAL] Re: Grrr! Yes, TSO TRANSMIT destroys PDSes (Rant)
>> 
>> A FB 80/27920 has 2 blk per track = 55840 bytes of 56664 = 98.5%
>> 
>> A FB/6160 has 8 blk per track = 49200 bytes of 56664 = 86.9%
>> 
>> It is a important difference, but not huge.
>> 
>> El jue, 18 dic 2025, 22:16, rpinion865 < 
>> [email protected]> escribió:
>> 
>>> Broken record here.  But I see our QR libraries with the following 
>>> DCB information FB 80/6160 non-loadlib datasets and U 0/6133 for 
>>> load libraries.  The libraries are not large, but still why not join 
>>> at least the 1990s.
>>> 
>>> 
>>> 
>>> "Confidentially doc, I am the wabbit."
>>> 
>>> Bugs Bunny
>>> 
>>> Sent with Proton Mail secure email.
>>> 
>>> On Thursday, December 18th, 2025 at 3:59 PM, Mike Shaw < techs

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