Path: utzoo!utgpu!news-server.csri.toronto.edu!rutgers!usc!elroy.jpl.nasa.gov!sdd.hp.com!spool.mu.edu!uunet!shelby!agate!violet.berkeley.edu!39clocks From: 39clocks@violet.berkeley.edu (Peter Marinac) Newsgroups: comp.sys.next Subject: NeXT HDs, who makes them? Keywords: NeXT HDs, transfer rates, sizes Message-ID: <1991Feb3.025412.9529@agate.berkeley.edu> Date: 3 Feb 91 02:54:12 GMT References: <63452@brunix.UUCP> Sender: usenet@agate.berkeley.edu (USENET Administrator) Distribution: usa Organization: University of California, Berkeley Lines: 39 Looking at a NeXT product brochure I noticed that the "Mass Storage Options" for the cube are not described in a consistent manner. I know that the 660Mb and late 330Mb drives are made by MAXTOR, and ads for the NeXTStation reveal that the 105 is a low profile Quantum, but what about the others? And what's the difference between: raw burst transfer rate, maximum transfer rate (syncronous), and sustained transfer rate. I mean I can guess what they terms mean, but how do they effect "real world" operations? Here is how NeXT describes the hard disk it sells for the cube: 105 MB Hard Disk Drive 3.5", 3rd-height, 105MB formatted capacity, 17ms avg seek, 4.0MB/sec max transfer rate. (Made by: Quantum?) 200 MB Hard Disk Drive (optional) 3.5", 1/2-height, 200MB formatted capacity, 15msec avg seek, 4 MBytes/sec transfer rate(syncronous). (Made by:?) 400 MB Hard Disk Drive (optional) 3.5", 1/2-height, 406MB formatted capacity, 13msec avg seek, 4 Mbytes/sec transfer rate(synchronous). (Made by:?) 660 MB Hard Disk Drive 5.25" full height, 660MB formatted capacity, 16.5 ms avg seek, 2.5MB/sec raw burst transfer rate, 1.6MB/sec sustained transfer rate. (Made by: MAXTOR) 1.4 GB Hard Disk Drive 5.25" full height, 1.4 GB formatted capacity, 13ms avg seek, 4 Mbytes/sec maximum transfer rate. (Made by: ?) Interestingly enough, the same brochure states that the SCSI-2 connector has a transfer rate of 4.8MB/sec (burst rate), but does not specify a sustained rate, nor a rate for the internal port. last question: Is synchronous communication uniqe to SCSI-2 drives? Thanks alot, Peter Marinac, 39clocks@violet.berkeley.edu