X0 was most likely captured in standard NTSC DVD resolution 720x480 or 704x480, but keep in mind that the actual picture area of the letterbox is only 704x272
 The picture area of PAL letterbox is 704x324
 The picture area of PAL letterbox is 704x324 
So even if you captured a NTSC LD at 1920x1080 you would get 560x480 of real resolution and you just wasted tons of GB on your HD
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