Sentence:  It is assumed herein that each block includes 32 bytes, each sector includes 1 <WSD>kilobyte</WSD>, the buffer memory 116 includes 4 <WSD>kilobytes</WSD>, and read data is represented by one double word or 64 bits, as one word in this case consists of 32 bits. 
Meaning of the word marked with <WSD> tags:  A unit of storage capacity, equal to 1024 (210) bytes : a kibibyte. Frequently abbreviated KB.