Is there a shortage of HDD units in Japan?
There may be but there shouldn’t be, except for maybe external units since a special case needs to be made for them. As answered in a previous question, the HDD seems to actually be made by Maxtor. Maxtor is a hard drive company so there shouldn’t be a shortage of hard drives to make into HDDs and the PSBBN discs shouldn’t be hard to manufacture either. Sony has no real reason to say there’s a shortage and they can eliminate any shortage completely by just releasing the PSBBN discs on the market and saying which hard drives will work with it, or even just say to use that specific Maxtor drive.