This is from the pdf product info file I downloaded from Sony last 
year before we bought our drive

>DDS-4 drives provide full backward compatibility with the
>ability to read & write to DDS-3, DDS-2 and DDS-1 tapes.
>While enabling tape sizes (and costs) to be matched to the
>backup job, DDS-4 provides an easy upgrade path. Not only
>is it possible to move up from one format to another but
>also to operate in mixed environments.

Hope that helps.

Adrian Smith


>I'll check this out later today.
>
>matt barkdull wrote:
>>
>>  I don't think the DDS-3 drives will read the DDS-1 tapes, but will
>>  read the DDS-2.
>>
>>  Basically this means they are one step backward compatible.
>>
>>  DDS-3 will read/write DDS-2
>>  DDS-2 will read/write DDS-1
>>
>>  DDS-1 cannot read/write DDS-2
>>  DDS-2 cannot read/write DDS-3
>
>
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