On Thu, 12 Jul 2007 11:47:47 -0400, Ken Porowski wrote: >Out of curiosity, what is the PHYSICAL track size of modern disk (EMC, >IBM, etc.). >Is there an industry standard or is everyone different?
There is not an industry standard for track size. The standard is for sector size, though you may be able to format the drive with a different sector size. As the technology allows more data density, there are more sectors on each track as well as more tracks per inch. The last time I researched this, I found Seagate's web site to be useful. They have product manuals there for many of their drives. John McKown is correct about many drives recording more data on outer tracks than on inner tracks. When I looked up a drive there a few minutes ago, though, it seems to have only one size track of about 550K bytes. Since most RAID arrays get their data from several drives at once, you might consider the size of a logical track to be much larger. Don't forget that any access method that uses TTR will be limited to 256 records per track. -- Tom Marchant ---------------------------------------------------------------------- For IBM-MAIN subscribe / signoff / archive access instructions, send email to [EMAIL PROTECTED] with the message: GET IBM-MAIN INFO Search the archives at http://bama.ua.edu/archives/ibm-main.html
