DataOutputBuffer bufOut = new DataOutputBuffer();
/* Number of keys in this block */
bufOut.writeInt(1);
bufOut.writeUTF(key);
bufOut.writeLong(position);
bufOut.writeLong(size);
/* Write out the block index. */
raf.writeUTF(SSTable.blockIndexKey_);
raf.writeInt(bufOut.getLength());
raf.write(bufOut.getData(), 0, bufOut.getLength());