On Fri, Jul 29, 2011 at 2:04 PM, John Drescher <drescherjm AT gmail DOT com> 
wrote:
> On Fri, Jul 29, 2011 at 11:58 AM, rodrigobrim
> <bacula-forum AT backupcentral DOT com> wrote:
>> We have purchase DELL TL2000 (AKA IBM 3573-TL) with two LTO5 drives (model 
>> ULT3580-HH5). Bacula runs perfectly, but LTO3 tapes don't.
>>
>> In fact, my problem is about the tape data element. If I do dd, or tar 
>> command, these message is show:
>>
>> [email protected]:/dev# dd if=/dev/zero of=/dev/st0 bs=512 count=1
>> dd: writing `/dev/st0': Input/output error
>> dd: closing output file `/dev/st0': Input/output error
>>
>> With LTO4, works fine. We don't have any one LTO5.
>>
>> My system is ubuntu 10.04, with all updates (yesterday).
>>
>> Anyone cold help me?
>>
>
> I thought write compatibility for LTO only went back one generation.
> But read compatibility goes back 2 generations.
>

I was correct:

"What are the backward compatibility characteristics of the Ultrium format?
The LTO Ultrium compatibility is defined with two concepts
demonstrating investment protection: 1) An Ultrium drive can read data
from a cartridge in its own generation and two prior generations. 2)
An Ultrium drive can write data to a cartridge in its own generation
and to a cartridge from the immediate prior generation in the prior
generation format. "

http://www.lto-technology.com/About/faq.html

John

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