ocr: Apple Hard Disk 40SC System Requirements See the. Apple Hard Disk 20SC for the Apple Hard Disk 40SC systcm requirements. Product Details SCSI expansion devices to: an Apple Ile or Apple SCSI expansion lets you connect IIGs, or as many as Six toa as many as three additional SCSI Macintosh. Technical Specifications Capacity Data capacity: 40 megahyrtes(formated) Data surtaces: 30r4 Heads/Surfacc: 1 Block size: 512bytes Total disk blocks: 82,020 Blocks/Track: 28,33,0r35 Characteristics Average seek cime: 30 milliseconds Rotational speed: 3,600or 3,662 rpm Startup time: 20 seconds Spin-downt time: ...