Re SD cards.
There are three main form factors
1) SD cards. I am sure we are all familiar with these.
2) MinSD cards. Mainly made for mobile phones where SD cards were too large. For a hot moment miniSD was cheaper than micro but also smaller than SD. Kind of stopped being made when microsd got cheap, good speed and good storage density.
3) MicroSD cards. I am sure we are all familiar with these.
Electrically speaking they are all the same thing, hence the adapters that are little more than shells with some wire in.
In addition to that there have been various revisions of the protocol (there is also another technical earlier/at the same time as SD but we will skip that).
SD. These were up to 2 gigabytes, technically there were some off spec ones that went to 4 but these are rare as anything and usually tricky to use (not to mention finding them in microSD is even harder and miniSD I am told exist but money no object I doubt I could find one).
SDHC. These were up to 32 gigabytes.
SDXC. Up to 2 terabytes.
SDUC has been around for a few years but is still rare.
Generally speaking anything newer can use older cards, though there are still some problems with file systems to try to stay with things.
As far as the EZ4 was concerned it started off not even supporting 2 gig cards and needed an update to make it there (though to be fair at the time they were as expensive as the largest stuff is today and it was mainly some kid tried one his dad got for work that we first saw it work with).
They stuck at 2 gigs (the limit for SD) for years and years.
Eventually the EZTeam came back and released updates for the EZ4. Among those was drag and drop and the ability to use SDHC memory (up to 32 gigs, do note this as there are some really nice deals on 64 gig cards in real world shops that people are tempted by. 32 gigs might be small for your phone but the entire GBA ROM set more or less fits in that and you don't want the entire site. 1000 of the best games + all the NES, Master System, Game Gear, PCE, gameboy, gameboy color and whatever else will comfortably sit in it).
The DS lite revisions of the EZ4 all use microSD but the original GBA size ones and a later respin all used miniSD, today it (and the Omega that replaced it) use microSD and are available in full GBA size carts.
Annoyingly as well the micro to miniSD adapters are frequently terrible. I have no idea why this is -- I have SD to microSD adapters that have been bent, crushed, stepped on, dropped, thrown, crashed off motorbikes at 100mph... all just fine for well over 10 years. It is however what it is and 95% of problems that are not just software related are solved by people finding a proper miniSD for those models with it. Back when you used to be able to go find them in shops selling old mobile phones but today they are rare as anything.
Anyway none of this really applies to the everdrive.
Re SD cards.
There are three main form factors
1) SD cards. I am sure we are all familiar with these.
2) MinSD cards. Mainly made for mobile phones where SD cards were too large. For a hot moment miniSD was cheaper than micro but also smaller than SD. Kind of stopped being made when microsd got cheap, good speed and good storage density.
3) MicroSD cards. I am sure we are all familiar with these.
Electrically speaking they are all the same thing, hence the adapters that are little more than shells with some wire in.
In addition to that there have been various revisions of the protocol (there is also another technical earlier/at the same time as SD but we will skip that).
SD. These were up to 2 gigabytes, technically there were some off spec ones that went to 4 but these are rare as anything and usually tricky to use (not to mention finding them in microSD is even harder and miniSD I am told exist but money no object I doubt I could find one).
SDHC. These were up to 32 gigabytes.
SDXC. Up to 2 terabytes.
SDUC has been around for a few years but is still rare.
Generally speaking anything newer can use older cards, though there are still some problems with file systems to try to stay with things.
As far as the EZ4 was concerned it started off not even supporting 2 gig cards and needed an update to make it there (though to be fair at the time they were as expensive as the largest stuff is today and it was mainly some kid tried one his dad got for work that we first saw it work with).
They stuck at 2 gigs (the limit for SD) for years and years.
Eventually the EZTeam came back and released updates for the EZ4. Among those was drag and drop and the ability to use SDHC memory (up to 32 gigs, do note this as there are some really nice deals on 64 gig cards in real world shops that people are tempted by. 32 gigs might be small for your phone but the entire GBA ROM set more or less fits in that and you don't want the entire site. 1000 of the best games + all the NES, Master System, Game Gear, PCE, gameboy, gameboy color and whatever else will comfortably sit in it).
The DS lite revisions of the EZ4 all use microSD but the original GBA size ones and a later respin all used miniSD, today it (and the Omega that replaced it) use microSD and are available in full GBA size carts.
Annoyingly as well the micro to miniSD adapters are frequently terrible. I have no idea why this is -- I have SD to microSD adapters that have been bent, crushed, stepped on, dropped, thrown, crashed off motorbikes at 100mph... all just fine for well over 10 years. It is however what it is and 95% of problems that are not just software related are solved by people finding a proper miniSD for those models with it. Back when you used to be able to go find them in shops selling old mobile phones but today they are rare as anything.
Anyway none of this really applies to the everdrive.