Can't format 128GB SD card as Internal Storage on 128GB Galaxy Note 9

[klatu]

Inserted a new unformatted micro SD card into the 128GB Galaxy Note 9. Went to storage-SD card, and was only given the option to format the card which made it removable or Portable Storage. Looked on Internet and see instructions saying go up to top right 3 dots to select the format. No such option in my Note 9. Removed SD card and inserted into Windows PC and was able to format and access the SD card. It is not bad. (Class 10 v30 I U3). Replaced it in the Note 9 and got same results as before. It is recognized as Portable Storage.

How do I make it Internal Storage?

 

[AugieTN]

What brand is the SD card? Is SD, SDHC, SDXC?

 

[Hadron]

Higher end Samsung phones don't support formatting sd as internal.

Before you ask why, you'd have to ask Samsung to get a definitive answer (assuming they did reply). My theory has always been that they don't want bad publicity about their flagship phones' performance due to people using cheap crappy cards as internal storage (wouldn't matter that it was the user's own fault, the typical social media user wouldn't understand that). Providing an incentive to buy a higher capacity phone might have been a part, but I suspect that was a lesser consideration (in many markets only one model would be easily available anyway a few years back).

 

[bunghole]

why do you want to set your sd card as internal on a note 9? they start at 128gig internally!

and yes as @Hadron said the note 9 does not have this capability.