File Storage and Transfer
Alesis developed their own method of writing to disk which interlaces the audio of the various tracks on disk. Although this does not entirely resolve fragmentation issues, it greatly reduces them. This prevents many seek operations, allowing the HD24 to use cheap IDE drives for 24 track audio storage.
Disks formatted with Alesis' proprietary FST file system are not currently recognized by today's operating systems. Therefore, to permit interoperability between computers and the Alesis ADAT HD24, the HD24 recorder is equipped with a built-in FTP server. This does not require any additional hardware, but is generally considered slow, and many users have experienced dropped connections (which has been attributed to expired DHCP lease).
The combination of low transfer rates and dropped connections of the built-in FTP server has driven many HD24 users to opt for an external file transfer solution. The available options are the Alesis Fireport in combination with Alesis' FST/Connect software, or an HD24-compatible drive bay with the third-party HD24tools suite. Either combination allows for file transfers with a theoretical transfer rate of 400 megabit per second. However, in reality, this rate is seldom achieved as the throughput of the hard drive itself can be a limiting factor.
Read more about this topic: Alesis ADAT HD24
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