LiteOn LDW-851S DVD +/- R Review - Write Tests

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A quick explanation about read/write schemes. The LiteOn LDW-851S utilizes Zone-Constant Linear Velocity (Z-CLV) for DVD+R; Constant Linear Velocity (CLV) for DVD-R, DVD+RW, and DVD-RW; Partial-Constant Angular Velocity (P-CAV) for CD-R and CDR-RW; and Constant Angular Velocity (CAV) for DVD and CD read.

CAV - Constant Angular Velocity
The read/write speed is increased at a constant rate. The drive does not reach its maximum speed until the end of the disk.

P-CAV - Partial-Constant Angular Velocity
The read/write speed is increased at a constant rate until the drive reaches its maximum read/write speed then remains constant.

CLV - Constant Linear Velocity
A constant speed is used throughout the read/write process, from the inner to the out tracks. CLV is the only mode that fully utilizes a drives rated speed.

Z-CLV - Zone-Constant Linear Velocity
The read/write process is divided into sections (zones). Each zone is read/written at a constant speed, then increased for the next section until it reaches its maximum speed.

Burn DVD-R

While the LDW-851S is a 8x drive, it can only burn DVD-R media at 4x (shown above). The LDW-851S completed burning a nearly full DVD in just under 15 minutes.

Burn DVD+R

Using +R media the LDW-851S is able to stretch its legs and run at its full 8x speed, completing the disk in 10 minutes. The speed is not half of the -R's 4x speed because of the difference in writing schemes. -R uses CLV and +R uses Z-CLV.

Burn CD-R

CD-R burning looks good. The LDW-851S burned a 667 MB CD-R at 40x in just over 3 minutes.

Burn Quality

This program examines the errors on a burnt piece of media. If errors are present, it doesn't mean the drive is faulty; it can also mean the media is less than desirable. However, if little to no errors are present, then it verifies the drive, media, and firmware are all working well together. Acceptable error rate is less than or equal to 280 for PI (C1) correctable errors and less than or equal to 4 PI (C2) uncorrectable errors or failures. The highest PI error was 14, and the highest PI failure was 3, both well below the standard limits.

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