Re: easy project? IBM Microdrive

["John" <applemann2@hotmail.com>]

I have a 345 MB maxtor SCSI drive that if it will work in your computer I
will sell to you.  I have it in a box just sitting around.  Let me know if
you are interested.


John




"Michael J. Mahon" <mjmahon@aol.com> wrote in message
20040217234920.11350.00002007@mb-m05.aol.com">news:20040217234920.11350.00002007@mb-m05.aol.com...
> Dave Althoff Jr wrote:
>
> >Michael J. Mahon (mjmahon@aol.com) wrote:
> >: This brings this tread full circle!
> >
> >: The discussion started with a concern about the long-term write
> >: endurance of CF cards used as primary "hard disks".
> >
> >: Even with wear levelling, and with the 100,000-class re-write
> >: endurance of newer CF cards, there remains some concern about
> >: the practical lifetime of these devices when used daily in a high-
> >: update environment, like software development.
>
> Thought I should update my thinking in the wake of reading the
> SanDisk CF specifications..
>
> They no longer use traditional wear-levelling, since the endurance
> of a typical (16KB) block is 300,000 re-writes or better.  Instead,
> the use a complex error correction code, and, when they observe
> that a block is becoming error-prone (due to wear or what-have-you),
> they relocate it to a spare, young block.
>
> Since it is extremely unlikely that there would be more than a
> very few blocks that get concentrated re-writes (like the bit map
> in ProDOS or the FAT in a FAT file system), this approach to
> managing wear-out seems quite good.
>
> Of course, real-world experience is always the best...
>
> >So here's a real-world question, then...
> >
> >On Sunday night, my 250Mb SCSI drive in my IIgs stalled.  This is a drive
> >that has been up and running more-or-less 24/7 for the past ten years or
> >so.  I was running a specialized text file editor in Applesoft and all
the
> >sudden it just quit.
> >
> >So...
> >
> >To put this system back together again, given that I have a High Speed
> >SCSI card and a Vulcan power supply/case and all the cables necessary for
> >an internal SCSI drive...
> >
> >Anybody got any sugestions for my best way to proceed?  Should I be
> >digging up another tiny little SCSI drive, or should I be looking at some
> >kind of SCSI->memory card adapter?
>
> I'm not aware of any SCSI-->CF adapters--this world seems to be primarily
> IDE, since CF natively supports an IDE mode.
>
> One advantage to SCSI is the ease of connecting two drives, so that
> one can easily back up the other with a speedy volume copy.
> (IDE can theoretically support this, but most IDE controllers seem
> to handle only a "master" drive.)
>
> -michael
>
> Check out amazing quality sound for 8-bit Apples on my
> Home page:  http://members.aol.com/MJMahon/