[Coco] Largest supported HDD size?

[Bill Pierce]

Jim, the limit is the 24-bit sector count in the drivers. In OS9, you can configure for cluster sizes larger than 1, making about 4g the limit. With a cluster size of 1, 128meg is the limit. Partitions can be setup, but still limited to the 24-bit partition offset.
As for RSDOS, the number of disk images is limited by the 8-bit counter (255), but, with hdbdos, using partition offsets, quite few partitions of 255 disks may be possible (not sure how many, again, the offset is 24-bit). The offset has to be poked manually into hdbdos.

 

 


Bill Pierce
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-----Original Message-----
From: Allen Huffman <alsplace at pobox.com>
To: CoCoList for Color Computer Enthusiasts <coco at maltedmedia.com>
Sent: Wed, Nov 30, 2016 7:17 am
Subject: Re: [Coco] Largest supported HDD size?

The hardware can address a certain amount of sectors, but the software has to be able to deal with that. OS-9, for instance, is limited to 4GB. Nasty details here:http://subethasoftware.com/2015/02/03/manually-making-a-bootable-nitros9-hard-drive-image-part-2/> On Nov 30, 2016, at 2:15 AM, RETRO Innovations <go4retro at go4retro.com> wrote:> > My google fu must be lacking tonight, as I thought it would be trivial to see how big a HDD is supported on the Coco via an IDE or SCSI interface, but I came up empty.> > I figured the CocoSDC can use an unlimited drive, as you mount images by name, but what about the GLenside IDE or the various SCSI systems?  Is it really 255 drive images * 170kB, or is there another limit?> > Jim> > -- > RETRO Innovations, Contemporary Gear for Classic Systems> www.go4retro.com> store.go4retro.com> > > -- > Coco mailing list> Coco at maltedmedia.com> https://pairlist5.pair.net/mailman/listinfo/coco-- Coco mailing listCoco at maltedmedia.comhttps://pairlist5.pair.net/mailman/listinfo/coco