Original sentence: As they queue up for the paging device, the ready queue empties.If the CPU utilization is too low, The OS increases the degree of multiprogramming by introducing new processes to the system.The new process tries to get started by taking frames from running processes, causing more page faults and a longer queue for the paging device - which, for example, might be a drive-space on the local disk or on a portable USB hard-disk drive (HDD)
Edited sentence: As they queue up for the paging device (which, for example, might be a drive-space on the local disk or on a portable USB hard-disk drive [HDD]), the ready queue empties.If the CPU utilization is too low, the OS increases the degree of multiprogramming by introducing new processes to the system.The new process tries to get started by taking frames from running processes, causing more page faults and a longer queue for the paging device.The obvious flow-on is a compound affect