Microsoft has stated that a 2:1 compression ratio is typical, so a 4 GB cache would usually contain 8 GB of data.

Requirements

For a device to be compatible and useful, it must conform to these requirements:
* The removable media's capacity must be at least 256 MB (250 MB after formatting, Windows 7 reports in its Event Log a required minimum of 235 MB).
* Windows 7 allows up to eight devices for a maximum of 256 GB

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