Re: easy project? apple scsi hd on a card ie..scsi expander

["Bill Garber" <willy46pa@comcast.net>]

"M. Pender" <mpender@hotmail.com> wrote in message
BC4EF88F.4FF8%mpender@hotmail.com">news:BC4EF88F.4FF8%mpender@hotmail.com...
: On 2/10/04 8:48 PM, in article
ioednTzUtOG0F7Td4p2dnA@comcast.com, "Bill
: Garber" <willy46pa@comcast.net> wrote:
:
: > : CF cards have a limited number of read/write cycles.
: > : I wouldn't want to depend on one as a hard drive.  And
: > : its not that notebook drives are becoming scarce, its
: > : just SCSI drives.  The modern PCs and Macs all use IDE
: > : drives now.
: >
: > If you knew anything about CF cards, you'd realize
: > that the limitation is not that low, and that it would
: > take a long time to wear one out completely.  I think
: > if you did a little study on them, starting with what
: > is so far compiled on the CFFA site, you'd change your
: > mind.
:
: I am quite familiar with CF cards; in fact I have a 32 MB CF
card
: that I tried using as a storage disk on a laptop and it started
: showing bit failures after only a few months use as a
read/write
: storage device.  And it was infrequent use at that.
: Perhaps by "wear one out completely" you mean that a person
could
: lock off access to the bad memory area and use other areas of
the
: disk.  It is true that a person can do that, but you still lose
the
: information stored in the bad sectors of the CF media.  To me,
: that's not acceptable for a long-term solution.

Sandisk claims that their CF cards do that automatically and
rewrite
the data on the sectors reaching their limit to new sectors
marking
the old ones as bad, and that is only after more than 10,000
writes.
Which means you'd have to write the sector nearly 30 times per
day
for more than a year. There are 131,072 x 256 byte sectors in a
32MB
ProDOS partition. I am not going to do all of the math, but that
sounds
like a lifetime to me. I'll let you know when mine wears out so
badly
that I can no longer use it, and I doubt I will be getting back
to
you on that. Sorry you had a bad experience with them.

: In view of my first-hand experiences with CF media,
: I am unlikely to change my opinion in view of what is
: compiled at the web site.

Well, that is your decision, but let's not discourage
others from using them. They are not as bad as all that.

: So why bother with SASI/SCSI drives at all?  As I recall you
were
: selling some very nice 2.5" IDE drives with controller cards
from
: your web site not long ago.  Its not hard to find a 2.5" IDE
hard
: drive with a capacity of 2 GB or more.  That seems like a
better
: solution to me.

Very true. I was selling them and it remains that I have a few
800MB
drives left, but no cards. They can also be used on the CFFA
cards.
I haven't tried one yet, as only certain drives will work. The
only
reason I might use SCSI would be for CD and that is only until
one of
us writes a driver to use an IDE CD drive on the GS, which I
might be
doing if I ever get all my data together and get busy learning
how to
program these things.   8-)

Bill @ GarberStreet Enterprizez };-)
Web Site - http://garberstreet.netfirms.com
Email - willy4SPAM6pa@comXcast.net
Remove - SPAM and X to contact me



---
This email ain't infected, dude!

Checked by AVG anti-virus system (http://www.grisoft.com).
Version: 6.0.576 / Virus Database: 365 - Release Date: 1/31/04