WD AV-GP vs WD GP?

[taltamir]

http://www.wdc.com/en/products/Products.asp?DriveID=615
http://www.wdc.com/en/products/products.asp?driveid=866
http://www.wdc.com/en/company/releases/PressRelease.asp?release=b1a99c2c-27cc-4575-9cc3-253da4ab6a63

As far as I can tell from reading the specs, the AV drives add:

SilkStream - Optimized for smooth, continuous digital video playback of up to twelve simultaneous HD streams. SilkStream is compatible with the ATA streaming command set so CE customers can use standard streaming management and error recovery options.

Preemptive Wear Leveling (PWL) - The drive arm frequently sweeps across the disk to reduce uneven wear on the drive surface common to audio video streaming applications.

1. are there any other differences that I am missing? They list a lot more features, but most of them are available in all WD drives and are compared to unnamed "competitors"
2. how does silkstream work?
3. why would you want PWL and when is it beneficial?

 

[taltamir]

Anyone knows?

 

[Emulex]

AV drives have ZERO error correction. none. TLER=0seconds. QNAP and Drobo can deal with this - not much else can (maybe tivo)

 

[taltamir]

AV drives have ZERO error correction. none. TLER=0seconds. QNAP and Drobo can deal with this - not much else can (maybe tivo)

is that what they mean by "silkstream technology"?