expression, godan verb (-ru)
partition a hard drive
Computing term for dividing a storage device into separate logical sections.
新しいSSDにパーティションを切って、OS用とデータ用に分けた。
I partitioned the new SSD into one for the OS and one for data.
パーティション is the noun 'partition'; パーティションを切る is the verb phrase meaning 'to create a partition'.
From English 'partition' plus the Japanese verb 切る (to cut, to divide).