From WikiTemp, the GBAtemp wiki

Compatibility List for Neek2o, a mod of SNEEK/UNEEK that lets you run Virtual Console/WiiWare from EmuNAND.

Compatibility Legend Class (?)
Games that work 100% or have few/very minor issues, like stuttering audio, or other things that don't affect gameplay. ct-works
Games that mostly work but with more serious but playable bugs, or random lockups (random doesn't mean lock up every time at the same spot in the game). ct-issues
Games that do not load and have major problems and/or are unplayable, or have consistent lock ups. ct-broken
Unknown status. Game has not been tested, or the test results were unclear. ct-noresult

2GB

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Device Name USB/SD(HC) sneek(+DI) uneek(+DI) sneek Uneek neek2o:sneek neek2o:uneek Comment
A-Data SD Works N/A Works N/A Untested N/A
Kingston Data Traveler USB N/A Untested N/A Untested N/A Works
PNY Mni Attache USB N/A Untested N/A Works N/A Untested
Sandisk microSD Works N/A Works N/A Untested N/A
Sandisk SD class2 Untested N/A Works N/A Untested N/A

4GB

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Device Name USB/SD(HC) sneek(+DI) uneek(+DI) sneek Uneek neek2o:sneek neek2o:uneek Comment
Integral SD(HC) Untested N/A Works N/A Untested N/A
SanDisk SD(HC) Works N/A Works N/A Untested N/A Works for BootMii@boot2 if installed

8GB

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Device Name USB/SD(HC) sneek(+DI) uneek(+DI) sneek Uneek neek2o:sneek neek2o:uneek Comment
Kingston microSD(HC) Works N/A Works N/A Untested N/A
Lexar microSD(HC) Works N/A Works N/A Untested N/A
SanDisk SD(HC) Untested N/A Works N/A Untested N/A
Toshiba Ginga USB Stick USB2.0 N/A Untested N/A Untested N/A Works Set cluster size to 16kb

16GB

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Device Name USB/SD(HC) sneek(+DI) uneek(+DI) sneek Uneek neek2o:sneek neek2o:uneek Comment
SanDisk microSD(HC) Works N/A Untested N/A Untested N/A

120GB

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Device Name USB/SD(HC) sneek(+DI) uneek(+DI) sneek Uneek neek2o:sneek neek2o:uneek Comment
Buffalo Ministation USB N/A Works N/A Untested N/A Untested

500GB

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Device Name USB/SD(HC) sneek(+DI) uneek(+DI) sneek Uneek neek2o:sneek neek2o:uneek Comment

{{Neek2o| iOmega Select | USB2.0 | N/A | Works | N/A | Untested | N/A | Works | set cluster size to 32kb |}}

LaCie RIIKI USB2.0 N/A Doesn't Work N/A Doesn't Work N/A Untested
WesternDigital Elements USB N/A Works N/A Untested N/A Untested
WesternDigital My Passport Elite USB N/A Works N/A Untested N/A Untested
Western Digital My Passport Essential USB N/A Works N/A Untested N/A Untested

750GB

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Device Name USB/SD(HC) sneek(+DI) uneek(+DI) sneek Uneek neek2o:sneek neek2o:uneek Comment
WesternDigital My Passport USB2.0 Untested Works Doesn't Work Untested Untested Untested

1TB

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Device Name USB/SD(HC) sneek(+DI) uneek(+DI) sneek Uneek neek2o:sneek neek2o:uneek Comment
SeaGate FreeAgent GoFlex Desk USB2.0/3.0 Untested Works Doesn't Work Works Untested Untested set cluster size to 32kb
SeaGate FreeAgent GoFlex Portable USB2.0 Works Untested Doesn't Work Untested Untested Untested
Toshiba Stor.E ALU USB2.0 Untested Untested Doesn't Work Untested Untested Works Set cluster size to 16kb or 32kb; you can have split FAT32/NTFS partition; FAT32 should be Primary/Active!
WesternDigital Elements USB Untested Works Doesn't Work Untested Untested Untested
WesternDigital Elements USB Works Untested Doesn't Work Works Untested Untested
WesternDigital My Book Essential USB Untested Doesn't Work Doensn't Work Doesn't Work Untested Untested
WesternDigital My Passport Elite USB Untested Works Doesn't Work Works Untested Untested
WesternDigital MY Passport Essential SE USB Works Untested Doens't Work Works Untested Untested

1.5TB

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Device Name USB/SD(HC) sneek(+DI) uneek(+DI) sneek Uneek neek2o:sneek neek2o:uneek Comment
SeaGate FreeAgent GoFlex Portable USB2.0 Works Untested Doesn't Work Works Untested Untested

2TB

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Device Name USB/SD(HC) sneek(+DI) uneek(+DI) sneek Uneek neek2o:sneek neek2o:uneek Comment
HITACHI XL Desk USB2.0 Untested Doesn't Work Untested Untested Untested Untested

Custom Setup

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Device Name USB/SD(HC) sneek(+DI) uneek(+DI) sneek Uneek neek2o:sneek neek2o:uneek Comment
Gembird IDE / SATA to USB 2.0 bridge USB2.0 Untested Works Doesn't Work Works Untested Untested