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- Xref: sparky comp.sys.intel:1558 comp.sys.palmtops:2735
- Newsgroups: comp.sys.intel,comp.sys.palmtops
- Path: sparky!uunet!wupost!uwm.edu!csd4.csd.uwm.edu!anthony
- From: anthony@csd4.csd.uwm.edu (Anthony J Stieber)
- Subject: Re: Flash Cards
- Message-ID: <1992Aug23.050415.14904@uwm.edu>
- Sender: news@uwm.edu (USENET News System)
- Organization: Computing Services Division, University of Wisconsin - Milwaukee
- References: <1992Aug17.102539.8782@monu6.cc.monash.edu.au> <1992Aug19.133302.3243@crd.ge.com>
- Date: Sun, 23 Aug 1992 05:04:15 GMT
- Lines: 49
-
- In article <1992Aug19.133302.3243@crd.ge.com> davidsen@crd.ge.com (bill davidsen) writes:
- >In article <1992Aug17.102539.8782@monu6.cc.monash.edu.au>, rda758g@monu6.cc.monash.edu.au (A.J. Kleinert) writes:
- >| The "new" intel flash cards were one of the features of a local computer
- >| show here recently ... one of the Sales guys advised me that they
- >| weren't actually for sale yet, but when they will be around
- >| the US$800.00 mark for a 20 Mb card. Isn't this is a little expensive for
- >| a solid state device? Were 3.5 inch floppy disks anything like this price
- >| when they first came out?
- >
- > 20MB hard drives were more than that when they came out. Are you
-
- Yes, and even $800 for 20MB of solid state memory in the space of four
- or so stacked credit cards is *very* cheap. Right now the cheapest 2MB
- SRAM PCMCIA card is nearly $700. I'd much rather pay $800 and have it
- fit in one slot rather than $7000 and have to juggle cards.
-
- >They also don't take in air to float the heads, since clean air is often
- >not availbale in industrial situations.
-
- In addition, although the Kittyhawk is very durable for a hard drive
- (100g operating shocks) a solid state device could probably take
- several times that. Flash EPROM devices take much less power to run,
- have very fast consistant read access times, and are immune to magnetic
- fields. I'm not sure, but I think a Kitthawk drive needs at least a
- Type III PCMCIA cavity (10mm), while a 20MB Flash card will probably
- fit in a Type II (5mm) and maybe even a Type I cavity (3.3mm). None of
- the current palmtop computers have Type III cavities. Of course, no
- current palmtop has an EPROM programmer either, so Flash cards are read
- only devices in them.
-
- > Unless the figure for number of writes has improved I don't think I
- >want to use it for a general purpose hard drive, for sure.
-
- The preliminary Intel 4MB Flash card data sheet gives a Erase/Write
- MTBF of 10^6 hours. I don't know what this means, it might mean
- failure after 114 years of continuous read/write cycles.
-
- The Microsoft Flash File System is supposed to fix some of the problems
- with writes. One is that it takes seconds to erase a sector, where a
- sector might be 256KB or more.
-
- >| Any comments on these pricing policies?
-
- I think it's reasonable. If you don't like them, check out SunDisk,
- they've supposedly had 20MB Flash cards for a year or so. There are
- now perhaps a dozen companies making PCMCIA memory. Competition
- will make prices drop.
- --
- <-:(= Anthony Stieber anthony@csd4.csd.uwm.edu uwm!uwmcsd4!anthony
-