user: Question: List the number of RamSan-720 hard drives?
Columns: ['Product Name', 'Form Factor', 'Storage Medium', 'Max Usable Capacity (GB)', 'Speed ( IOPS )', 'Latency (microseconds)', 'Bandwidth (GB/s)']
Types: ['text', 'text', 'text', 'real', 'real', 'real', 'text']
Sample row: ['RamSan-440', '4U rackmount', 'DRAM', 512.0, 600000.0, 15.0, '4.5']
SQL:

assistant: SELECT COUNT("Storage Medium") FROM "Table" WHERE "Product Name" = 'RamSan-720';