Below is the list of tables from the database along with their columns and datatype. Need to generate an accurate SQL query for the question.
Only use the columns present in the respective table. Only use the columns which are required to generate the SQL query. Only use table joins if required and not otherwise.

### Tables ###
TABLE: CREATE TABLE table_74153 ( "Product Name" text, "Form Factor" text, "Storage Medium" text, "Max Usable Capacity (GB)" real, "Speed ( IOPS )" real, "Latency (microseconds)" real, "Bandwidth (GB/s)" text )

### Question ###
List the number of ramsan-720 hard drives?

### Accurate SQL ###

SELECT COUNT("Storage Medium") FROM table_74153 WHERE "Product Name" = 'RamSan-720'