static int getWriteBytes(final byte[] data) {
        return RECORD_MAGIC_BYTES_SIZE + RECORD_DATA_LENGTH_SIZE + data.length;
    }
Clear data in [startPos, startPos+64).

@param startPos the start position(inclusive)
jraft-core/src/main/java/com/alipay/sofa/jraft/storage/log/SegmentFile.java