Kamm Schreiner <kamm@...> wrote: : : > Heres how I defrag my audio drive. I backup my entire Lacie : > 160GB fw drive to my internal 160gb backup drive. Erase it, : > then copy everything back. Bam its defragged as best as its : > gonna get. And FYI, it has not helped a single bit in getting : > any higher track counts or less of a CPU load. Hate to say it : > but its not really worth it to even bother.. : : I tend to agree with Chris that defragging isn't likely to make much of a : difference unless the disk is really fragmented badly and you are accessing : a lot of audio simultaneously. Even then, if it is a FireWire connection to : the computer, the FireWire could end up being more of a bottleneck than the : fragmented files. FireWire is 400 Mbps (mega "bits" per second). A Serial : ATA drive is 150 MBps (mega "Bytes" per second). That's equivalent to 1,200 : mega bits per second. That's 3x faster than a FireWire 400 interface. : : Still, 400 Mbps is damn fast. You can get 50 MB of data every second. That's : an entire CD Wave track in one second. Or eight entire CD tracks in 8 : seconds. : : If you have 20 mono audio tracks at 44.1kHz and 16 bits, that's 88,200 bytes : per second times 20 = 1.764 MBps. Well within the 50 MBps that's available. : : Double check my math. I did the calculations fast and didn't double check. Of course, no drive mechanism can deliver sustained throughput that even approaches the speed of the bus being used. A typical modern 7200RPM SATA drive, while capable of bursting to 150MB/s while reading cached data, will probably deliver a sustained throughput of around 40MB/s at best. Of course, the more devices you have on a Firewire bus or an SATA bus, the more the bandwidth needs to be shared, and you will max out if those devices are all moving data simultaneously. -- agreenbu @ nyx . net andrew michael greenburg
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Re: [Logic_Cafe] defrag by booting off another computer.
2005-02-09 by amgmamgma