Mr O wrote: > I want to benchmark my read speeds on my cdrom's. How?
time dd if=/dev/cdrom of=/dev/null bs=<a multiple of 2048> multiply records by block size for bytes transferred. divide bytes by seconds for bytes/second. divide by 1024 or 1048576 for kbytes or mbytes/second. Try different block sizes for fun. Eject and reinsert the disk to avoid the buffer cache. BTW, CD-ROMs have different speeds on different parts of the disk. They're neither CAV nor CLV. (CAV is Constant Angular Velocity - the disc spins at a fixed speed. CLV is ...Linear... - the disc moves past the laser at a fixed speed.) You can use dd's count=<number> parameter to read only the first part of the disc. -- Bob Miller K<bob> kbobsoft software consulting http://kbobsoft.com [EMAIL PROTECTED]
