The AEC-1000 consists of a DVD Drive and the "ALChecker" error measurement application which can check the written data quality. The application is capable of 1X CLV measurements as well as 4X CLV on DVD-Video/ROM and finalized DVD+R/-R media.

There are three measurement modes:

• Fine Mode: checks a series of eight consecutive ECC blocks,
• Rough Mode: checks eight consecutive ECC blocks every 100h ECC blocks
• Quick Mode: checks three specified areas

The checking status is shown graphically. The reported errors are the PI and the UncPO. In the case of PI, it counts the number of rows corrected by the PI error correction in each group of eight consecutive ECC blocks. In the case of UncPO, it counts the number of ECC blocks in which more than one byte is uncorrectable in eight consecutive ECC blocks. For our quality scans, we set for 1X CLV and Fine Mode which is the slowest and with the safest results. Also, we chose to measure all the media burned at the maximum available writing speed, namely 16X.

- Ricoh 16X DVD+R @ 16X

- Prodisc S05 16X DVD-R @ 4X

- MKM 16X DVD-R @ 16X

- Moser Baer 16X DVD-R @ 16X

- Ridisc 16X DVD+R @ 16X

- Maxell 16X DVD-R @ 4X

Four out of six burned media were found to be of good quality. Unfortunately, Maxell burned at 4X and Ridisc burned at 16X, were found to be of bad quality, reporting 1 UncPO error value.