DVD9 version box set , 4 discs with whole episodes ,audio in Mandarin , Chinese subtitles , free worldwide shipping

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What is the difference between DVD5 (regular_version) and DVD9 (economic_version)?

DVD5 (regular_version) is a single sided single layer DVD that stores up to about 4.7 GB = 4 700 000 000 bytes and that is 4.38 computer GigaBytes where 1 kilobyte is 1024 bytes(4 700 000 000B/1024 = about 4 589 843KB/1024 = about 4485MB/1024 = about 4.38GB) . Video DVD, DVD-R/W and DVD+R/W supports this format. Often referred to as "single sided, single layer".

Since a DVD5 storage space is only about 4.7GB, the DVD5 box set comes in many discs to accommodate the complete set. It comes in a PAPER CASE COVER with another inner PLASTIC casing. Discs comes in sleeves.

DVD9 (economic_version) is a single sided dual layer DVD which can fit up to 8.5 GB or 7.95 computer GB which many commercial video DVDs are using today (a DVD-9 is basically two pressed plastic DVD-5s pressed together, they are not burned). Video DVD supports this format but DVD-R/W and DVD+R/W does not support this format.

We have two types of casing for our DVD9 Box set, depending on titles and availability. Since a DVD9 has about double the storage space of a DVD5, it use less discs to make up the complete set. For this reason, the spine of the box is thinner than the spine of the DVD5 box set. It comes in a HARD CASE COVER. A DVD9 box set will open up similar to a book.  The DVDs are store securely inside the panel(s).