Paper Tape (was: Let's develop an open-source media archive standard )

>> -----Original Message----- >> From: cctalk-bounces(a)classiccmp.org >> [mailto:cctalk-bounces@classiccmp.org] On Behalf Of Hans Franke >> Sent: Friday, August 13, 2004 3:27 PM >> To: General Discussion: On-Topic and Off-Topic Posts >> Subject: Paper Tape (was: Let's develop an open-source >> media archive standard ) >> >> Am 13 Aug 2004 14:55 meinte John Lawson: >> > On Thu, 12 Aug 2004, Stan Barr wrote: >> > > Hi, >> > > ben franchuk <bfranchuk(a)jetnet.ab.ca> said: >> > >> Stan Barr wrote: >> > >>> Work is still in progress. Shizuka University in >> Japan recently >> > >>> demoed >> > [snippage] >> > >> What is too slow. Paper Tape is slow. :) >> > > They don't say how fast, but imagine how long it would >> take to read >> > > 2000Gb at paper tape speeds :-) >> >> > No need to imagine - Calculate: >> >> > Lets say that the Paper Tape is in ASCII format, then each >> > character is a Byte - and that the Reader is a fairly >> advanced optical >> > device running at a conservative 1200 bytes per minute. >> >> > 2000 GB (2 TB) is 2*10^12 >> >> > so (2*10^12)/1200 = 1.66666667*10^9 minutes to read 2 TB >> > /60 = 27,777,777.8 hours >> > /24 = 1,157,407.41 days >> > /365 = 3171 years >> > presupposing a Really Good reader that could operate >> that long w/out >> > any maintenance or downtime.... probably Sellam has a >> couple of these >> > on his Shelves. >> >> > NOW: 10 KB of 5-mil thick punched paper tape on a >> 3/4-inch hub >> > with a punch width of .060 and an inter-character width >> of .060 makes >> > a diameter of.... oops my brain just exploded - sorry. >> >> > But damn! that would be an impressive wheel of paper!!!! >> >> Nowwaitaminute.... Impressive Paper roll? that reminds me >> of news paper printing, and AFAIR they use speeds of above >> 40 km/h (25 mph) at at the press in one newspaper here in >> Munich (Sueddeutsche Zeitung)... With way less quality >> paper than paper tape used to be. >> >> Now .. let's for now assume a bit hole is about 1 mm in >> diameter, and the gap between is of equal size, thus one >> byte every 2mm. >> now, assumeing a speed of 40 km/h this gives 40,000,000/2 >> Bytes/h or 20 MByte/h transfer rate (or with around 333 >> KByte/min or 5 k/s almost 300 times the speed you assumed). >> The problem is still the paper transport, not optical >> sensing, since even an 8 Bit controler is be able to shovel >> awy the data. >> >> 2*10^12/2*10^7 >> >> ... gee that's easy to cancel down ... >> >> 1*10^5 hours >> or just about 14 Month >> >> Hey, that's fast! >> >> Average access time of just 7 Month - large enough paper >> roll assumed. >> (2*10^12*2^-3m = 4 mil km, or 11 times the distance >> eath/moon - hey, waitaminute, this means our reader can eat >> it's way to the moon in just a month :) >> >> Gruss >> H. >> It's your fault, John, you got me going :) >> -- >> VCF Europa 6.0 am 30.April und 01.Mai 2005 in Muenchen >> http://www.vcfe.org/ >>