The present invention provides an ink drying prevention apparatus that can prevent ink within an ink-jet recording head from drying, for a long period of time. An appropriate capacity of a site of a interested user is determined. in measurement through differential scanning calorimetry. The BPF serving as a limit circuit passes components in a bandwidth wider than the bandwidth of the signal to be amplified. Packet checker logic receives the early full detect signal and assesses the first byte of a packet header, to determine whether the buffer memory can store information. The blanket is formed of an upper, permeable layer and a lower, impermeable layer, which together form a closeable pocket for receiving an insert that is impregnated with one or more anti-flea agents.