Instruction: First, identify the target attributes from the provided list. Then, scan the product title, description, feature, and brand to extract the values associated with each target attribute. Finally, create a list of dictionaries, each containing the extracted attribute, its corresponding value, and the source where it was found.

Input:
Product title: Archgon USB 3.0 Aluminum External Blu-ray Burner Model MD-3107-U3-K w/Cyberlink BD solution
Product description: Archgon MD-3107-U3 is an external Blu-ray writer (read and writer all Blu-ray/DVD/CD) installed the latest Panasonic UJ-260 inside. MD-3107-U3 not only allows you enjoy watching Blu-ray movies or burning huge capacity of data smoothly, but also supports 3D function (depends your hardware and software support for Blu-ray or 3D functionality). MD-3107-U3 also built-in BD XL burning technology with Cyberlink BD solution which meets heavy users' needs. With power-saving technology, you won't need an additional adaptor anymore. The aluminum enclosure provides full protection for the drive. It is a perfect product that gives you more control in the Blu-ray world.
Product feature: USB 3.0 Interface, Premium Aluminum Casing, BDXL Format Support, No AC Adapter Required, Bundle Cyberlink Media Suite OEM custom version (DVD/Blu-ray playback, NOT Cyberlink retail version)
Product price: $1.90
Product brand: Archgon
Target attributes: Format
Answer: attribute: format
value: bd
source: product description
attribute: format
value: bd
source: product title
attribute: format
value: blu-ray
source: product title
attribute: format
value: bdxl
source: product feature
attribute: format
value: blu-ray
source: product feature