Block Size issue

Hi Team,

We use to use SIZE_DATA_BUFFERS a value of 262144 and backups use to work fine.

Now suddenly backups are failing with error "The tape device at index -1 has a maximum block size of 65536 bytes, a buffer size of 262144 cannot be used"

Where can we set block size for a tape drive is there any registry ??

Now when I change the SIZE_DATA_BUFFERS to 65536 backups run in non encrypted volume pool.

However I think the encription key we use is of 256Kand thats why I cant run backups in encryption pool.

Need help ASAP.

Many Thanks.