You need a Micro.... refers to the physical size of the card.
SD and SDHC refer to the capacity , Secure Digital for capicity 2Gb or less and Secure Digital High Capacity is used for cards with capacity between 4 & 32Gb.
You can use any capacity SD or SDHC in the Sony PRS-T1
I have a 16 Gb MicroSDHC Class 4.... £12 from 7dayshop
Class refers to the speed at which you can write to the card the higher the No. the faster you can write to it although this is also dependent on the device doing the writing !
The device can format your card for you, which personally I would recommend as then you can be certain it's formatted correctly for your device.
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