Support and General Use > Hardware
Are "1TB" micro-SD cards 1000GB or 1024GB?
iPodVT:
I've got a 512GB Samsung Pro Plus microSD in a thin 160GB 7th Gen iPod. Rockbox reports 477GiB.
jkn:
Having worked in this area as part of a previous job, I can speak a little to this
In most manufacturer's datasheet you will not find a guarantee of the actual capacity of an SD card. They will say "xMB, yGB etc" but they will not be more specific than that. This gives them leeway to: use different parts inside, change their wear levelling algorithms, etc. etc.
You would have to pay a lot of money (like, 5 to 10 times normal prices) for industrial-plus cards to get a guarantee of this sort of thing.
We used to have to go through batches of SD cards and work out the minimum capacity that you could 'guarantee'. But even then, and with the same part (supposedly) from the same manufacturer, we used to have to tweak the numbers from time to time.
Frankenpod:
Having just reoppened another modded ipod (to upgrade it), I find it has all Integral 512GB cards, but three of them are marked as "A1" and one as "A2" (not sure how I ended up buying different grade cards when I built this one, it's all lost in the mists of time!). Curiously the A1 cards are like the Sansa cards in actual capacity, while the A2 ones are the lower 461GiB I found with other Integral cards. Except for one A1 card that, strangely, comes out in between the two.
Integral A1 476.95 GiB
Integral A1 464.25 GiB
Integral A2 461.19 GiB
Integral A1 476.95 GiB
Again, only reporting it in case it's of any use to anyone else working out what cards to use for a flash mod.
Frankenpod:
@jkn
Thanks, that seems very relevant info.
Navigation
[0] Message Index
[*] Previous page
Go to full version