Hi all, as some are aware, there is a leadin bug that exists with the Nu 082 and B373 f/w. This causes irregular lead in gap to be written.
NicW has made Nu aware of this, thanks to Worker and Nic for their findings and fast action! and we have an official reply from Nu:
Nu has just found a CPRM issue. This bug means the NU drive has caused irregular data to be written at the start of the disc. CPRM is recorded incorrectly which can effect compatibility.
For a DVD-ROM, this will NOT be a problem - but for a set top system, this will be an issue, depending on the model!
For those that do not know what CPRM is:
[i]The version of CPRM specified for DVD-R and DVD-RW is similar to that defined for DVD-RAM, differing only in the nomenclature, placement, and structure of a few data items. Most of these changes were made to accommodate differences between the DVD-R/-RW and DVD-RAM media formats.
While key DVD-RAM data elements are hidden in a special Burst Cutting Area, the -R/-RW version stores them in an equivalent area known as a Narrow Burst Cutting Area (NBCA). One of these data items is the 64-bit Media ID, which differs from the DVD-RAM version only because its 4-bit Media Type field is set to either 0001 to denote DVD-R media or 0010 for DVD-RW.
In all other ways, the first NBCA record is identical to its DVD-RAM equivalent. But the next NBCA record, which stores 16 bytes of MKB Validation Data, is unique to the -R/-RW version of CPRM. It's structured like the previous record, except that it contains 16, rather than 10 bytes of data, and specifies a Record ID of 03 and a Record Length equal to 10 hex.
The Validation Data in this record consists of an 8-byte MKB_Hash value, which the DVD-RAM spec stores instead in the MKB Media Descriptor, and an additional eight bytes of MKB Verification Data that contain an encrypted DEADBEEF value. Devices can optionally verify that they've derived a valid Media Key by using it to decrypt the DEADBEEF test data.
The -R/-RW Media Key Block is stored in the Control Data Area much as it is on DVD-RAM discs. But it differs in that it's distributed across 176, rather than 192 ECC Blocks, thereby providing only 11 redundant copies of the MKB, rather than the 12 stored on DVD-RAM media. Furthermore, the Media Descriptor contained in each DVD-R/-RW MKB Frame is filled with zeros, since the MKB_Hash value in this case is part of the MKB Validation Data.
In most other ways, CPRM for -R/-RW describes data structures that are identical to those defined for DVD-RAM. [/i]
Courtesy of http://www.extremetech.com