Re: Drive capacity names (Was: WTB: HP-85 16k RAM Module and HPIB Floppy Drive

2017-11-17 Thread Chuck Guzis via cctalk
On 11/17/2017 09:17 AM, allison via cctech wrote: > Also the Syquest 270mb IDE/parallel port cartridge disk.  I have one > that works > and over a dozen carts.  Its still in use in a ITX box using the IDE > interface.  After > two decades of use it seems solid. I've left out the non-floppy

Re: Drive capacity names (Was: WTB: HP-85 16k RAM Module and HPIB Floppy Drive

2017-11-17 Thread allison via cctalk
On 11/16/2017 03:30 PM, Geoffrey Reed via cctech wrote: > > On 11/15/17, 9:44 AM, "cctalk on behalf of Fred Cisin via cctalk" > wrote: >> Can you name another 20 exceptions? (Chuck and Tony probably can) >> >> >> -- >> Grumpy Ol'

Re: Drive capacity names (Was: WTB: HP-85 16k RAM Module and HPIB Floppy Drive

2017-11-16 Thread Fred Cisin via cctalk
No, the 9122C has two high-density, two-sided 80 cylinder drives. A drive has no capacity, this is the function of the on-disk format. ;-) "high-density" is even more meaningless than referring to them by their capacity in a given format. It is a BOGUS marketing term! On Thu, 16 Nov 2017,

Re: Drive capacity names (Was: WTB: HP-85 16k RAM Module and HPIB Floppy Drive

2017-11-16 Thread Liam Proven via cctalk
On 16 November 2017 at 21:30, Geoffrey Reed via cctalk wrote: > > ³Floptical² disks 720 rpm 1.6 Mb/s transfer 1250 TPI and 25MB unformatted > capacity Just FYI, your quote marks render on Linux as superscript 2s. Using an Apple device? You might want to turn off smart

Re: Drive capacity names (Was: WTB: HP-85 16k RAM Module and HPIB Floppy Drive

2017-11-16 Thread Chuck Guzis via cctalk
On 11/16/2017 12:30 PM, Geoffrey Reed via cctalk wrote: > ³Floptical² disks 720 rpm 1.6 Mb/s transfer 1250 TPI and 25MB unformatted > capacity > > LS-120 and LS-240 (which sadly I can¹t remember the specs of :( How about the Caleb "it" drive (UHD144):

Re: Drive capacity names (Was: WTB: HP-85 16k RAM Module and HPIB Floppy Drive

2017-11-16 Thread Geoffrey Reed via cctalk
On 11/15/17, 9:44 AM, "cctalk on behalf of Fred Cisin via cctalk" wrote: > >Can you name another 20 exceptions? (Chuck and Tony probably can) > > >-- >Grumpy Ol' Fredci...@xenosoft.com ³Floptical² disks 720

Re: Drive capacity names (Was: WTB: HP-85 16k RAM Module and HPIB Floppy Drive

2017-11-16 Thread Peter Corlett via cctalk
On Wed, Nov 15, 2017 at 09:44:24AM -0800, Fred Cisin via cctalk wrote: [...] > 3.5" MFM "High Density" (sometimes called "1.44M", due to the most common > formsat being 1.41 Mebibytes, or 1.44 of a unit of 1000*1024 bytes), were > 300 RPM at 500,000 bits per second. (1M unformatted per side)

Re: Drive capacity names (Was: WTB: HP-85 16k RAM Module and HPIB Floppy Drive

2017-11-16 Thread Christian Corti via cctalk
On Wed, 15 Nov 2017, Fred Cisin wrote: On Wed, 15 Nov 2017, Christian Corti via cctalk wrote: No, the 9122C has two high-density, two-sided 80 cylinder drives. A drive has no capacity, this is the function of the on-disk format. ;-) "high-density" is even more meaningless than referring to

Re: Drive capacity names (Was: WTB: HP-85 16k RAM Module and HPIB Floppy Drive

2017-11-15 Thread Tapley, Mark via cctalk
On Nov 15, 2017, at 11:44 AM, Fred Cisin via cctalk wrote: > "400K" generally means Macintosh single sided, not DEC Rainbow, etc For once, the physical format disambiguates those two! The Rainbow disks are in flexible envelopes (and ~1.75” greater diameter). (Got many

Re: Drive capacity names (Was: WTB: HP-85 16k RAM Module and HPIB Floppy Drive

2017-11-15 Thread Fred Cisin via cctalk
No, the 9122C model has two 1.44M drives. HP made several earlier 3.5" On Wed, 15 Nov 2017, Christian Corti via cctalk wrote: No, the 9122C has two high-density, two-sided 80 cylinder drives. A drive has no capacity, this is the function of the on-disk format. ;-) "high-density" is even more

Re: Drive capacity names (Was: WTB: HP-85 16k RAM Module and HPIB Floppy Drive

2017-11-15 Thread Fred Cisin via cctalk
Note that there were always some exceptions. Weltec made a 5.25" drive at 180 RPM, to do "HIGH DENSITY"/"1.2M" at 250,000 bits per second on PC/XT. Sony made some 3.5" drives that were 600 RPM, to use 500,000 bits per second. NEC used 360 RPM 3.5" drives, to have the same format structure

Re: Drive capacity names (Was: WTB: HP-85 16k RAM Module and HPIB Floppy Drive

2017-11-15 Thread Mark J. Blair via cctalk
> On Nov 15, 2017, at 09:44, Fred Cisin via cctalk > wrote: > >>> No, the 9122C model has two 1.44M drives. HP made several earlier 3.5" > On Wed, 15 Nov 2017, Christian Corti via cctalk wrote: >> No, the 9122C has two high-density, two-sided 80 cylinder drives. A drive

Re: Drive capacity names (Was: WTB: HP-85 16k RAM Module and HPIB Floppy Drive

2017-11-15 Thread Paul Berger via cctalk
On 2017-11-15 1:44 PM, Fred Cisin via cctalk wrote: No, the 9122C model has two 1.44M drives. HP made several earlier 3.5" On Wed, 15 Nov 2017, Christian Corti via cctalk wrote: No, the 9122C has two high-density, two-sided 80 cylinder drives. A drive has no capacity, this is the function of

Drive capacity names (Was: WTB: HP-85 16k RAM Module and HPIB Floppy Drive

2017-11-15 Thread Fred Cisin via cctalk
No, the 9122C model has two 1.44M drives. HP made several earlier 3.5" On Wed, 15 Nov 2017, Christian Corti via cctalk wrote: No, the 9122C has two high-density, two-sided 80 cylinder drives. A drive has no capacity, this is the function of the on-disk format. ;-) "high-density" is even more