Hi Andreas,

thanks for your hints! it seemed to be the paper. now I bought some really 
expensive AVERY Zweckform L4775 labels and these labels are readable.
weird.
Thanks a lot anyway!
Otto

Andreas Rogge schrieb am Mittwoch, 26. März 2025 um 16:56:07 UTC+1:

> Hi Otto,
>
> that sounds like a bad barcode reader. However, HP will probably insist 
> you buy their overpriced labels before they agree that reader is broken...
>
> What I can tell you about LTO labels is:
> * paper and printing must be non-glossy
> * good contrast is important (glossy shining black bars are a no-go)
> * if you fail with different labels on different label-materials, try 
> another printer
> * the label must end in L1, L2, L3, L4, L5, L6, L7, L8, L9, LT, LU, LV, 
> LW, LX, LY, M8, or LZ
> * barcode bars must be at least 11mm high
> * the "quiet zone" left and right of the barcode should be empty and 
> larger is better
> * when you generated a PDF make sure it matches your page-size (DIN/ISO 
> vs. US formats) and you print without any scaling
> * try to avoid paper labels, go with polyester or sth. like that
>
> Best Regards,
> Andreas
>
> -- 
> Andreas Rogge andrea...@bareos.com
> Bareos GmbH & Co. KG Phone: +49 221-630693-86 <+49%20221%2063069386>
> http://www.bareos.com
>
> Sitz der Gesellschaft: Köln | Amtsgericht Köln: HRA 29646
> Komplementär: Bareos Verwaltungs-GmbH
> Geschäftsführer: Stephan Dühr, Jörg Steffens, Philipp Storz
>
>

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