a standard sandisk sdhc 32gb is the recommended upper limit for storage space. I dont think the nook app/widget can see any books on the card.
consider moving any content like music/movies to the card. thats what I do with all my google play movie downloads.
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While 32GB is recommended, I'll share that I use - with no ill-effects - a 64GB in my NOOK HD (for which 32GB is also recommended).
FYI, did you see these threads, which discuss using a microSD card with a SGT4N or NOOK HD/HD+?
- MicroSD Cards and Nook HD
- Re: Nook hd+ applications not responding and very slow - how to fix?
- Re: Summarize any downsides of the SGT4N vs. the regular SGT4
- Re: samsung galaxy tab 4 nook...hancom office...do I really need it?
- Bad news:
Regardless of microSD card capacity, however, be aware that recent versions of the Android OS prevent many apps from either being transferred to or from writing to the microSD card, on an unrooted device. [See, for example, External Blues: Google Has Brought Big Changes To SD Cards In KitKat, And Even Samsung Is Implementing Them and any of these articles.] Consequently, short of rooting (which breaks warranty and could damage your device, if performed improperly), you may have to use your computer to transfer to, modify, or delete data on your microSD card.
- Good news:
Some apps (and their associated content), CAN be moved to the microSD card on an unrooted device, by app managers such as the native Samsung app manager or by third-party apps such as Link2SD or Lucky AppManager.
- Even better news:
Update: With the release of Android 5.0 Lollipop, new APIs have been added that allow an app to request permission from users to access folders on external storage. This approach gives users the same level of functionality that has always been available, with greatly improved security. See Android 5.0 Makes SD Cards Great Again, Extends API To Allow Full Directory Access, Automatic MediaStore, And Improves Security
the question then becomes..when do we samsung galaxy tab 4 nook users gain access to lollipop?
If ashbag89 is looking for a solution to store more B&N ebooks and/or magazines using the B&N app, the answer is "you can't". B&N doesn't provide any mechanism for using secondary (card) storage within their app. You can sideload content to the card, but those ebooks won't be well integrated into the B&N library (e.g. no covers) and I'm not aware of any way to store B&N magazine subscriptions to a card.
To be clear: Android 4.x DOES allow apps to store files on secondary storage. The problem is that apps cannot access another app's data without root, so this breaks things like using Calibre Companion to download files and manage them with another app. If B&N modified their ebook software in exactly the same way they've already modified their video software, there's no reason we couldn't be using the extra capacity on a uSD card to store B&N ebooks and magazines today. It won't what version of Android @ashbag89 runs so long as B&N doesn't update their apps. This is the fundamental weakness of the Samsung NOOK.
On a technical level, I've used a variety of cards on my Samsung tablets. I'm currently running a Sandisk Extreme 64 GB card, but I've also had no issues with Sandisk Ultra 64 and 32 GB cards. Adding a card is still worthwhile, but it won't help with B&N ebooks and magazines without a lot of extra work.