2
The First Hard Disk Recorder Worthy of the Name ADAT
3. What is the sample rate and bit width?
HD24 records at 24bit and sample rates of 44.1k and 48k (88.1k and 96K when using the opti-
cal inputs and any third party A/D converters that support 96K sampling rates).
4. This is a proprietary format. How can I get files into my computer?
You can transfer standard .AIF or .WAV files from the ADAT HD24 to a computer or even to the
Internet using its built-in Ethernet port. In fact, as you’ll learn later in this document, you can set
up HD24 to act is it’s own FTP server and access files from your web browser. You can even
make files available on the internet directly from the unit.
5. Are there any other manufacturers using this type of format?
Currently, ADAT/FST is used only by Alesis. However, like other Alesis standards (such as ADAT
Optical and ADAT Sync), we anticipate other companies will support this advanced format.
6. Does the drive need to be de-fragmented?
No. The HD24's file system essentially de-fragments itself as it records. The "cluster size" of the
Alesis file system is much larger than other disk file systems, so files are easier to find. In
addition, all tracks for a given song are saved in adjacent sectors, not scattered in 24 different
locations. The end result? No matter how many songs you load on a disk, or how many
overdubs and edits you make, the drive never gets fragmented enough to affect performance.
It's important to note that the ADAT HD24's file system is NOT the same as "tape mode" in some
other hard disk recorders, which may erase songs following it on the drive. The ADAT/FST does
not permanently assign a given length of time in a particular song to any sector of the drive. It
is still random-access; it's just not as scattered as other disk formats.
7. What type of drives can be used?
Most currently-manufactured IDE drives (note that all "IDE" drives are
actually "EIDE" now) with a spindle rate of 5400 rpm or higher will work with the ADAT HD24.
Higher-speed IDE drives are acceptable as well. The only requirement is that it be ATA-4 com-
patible. Almost all drives currently sold meet this requirement, and most exceed it by a signifi-
cant margin. And costs are low: 20 GB drives are available for under $100, which makes them
as inexpensive per megabyte as tape. As an aid to our customers, Alesis plans to maintain an
approved drive list on the Alesis web site. HD24 does not use SCSI or SCSI-2 drives.
8. Is there a size limit for hard drives in HD24?
The current ATA specification for the maximum size of IDE drives is 137GB, but this is likely to
change soon. The ADAT/FST file system could support drives up to 2.2TB (2200 GB), and a
firmware upgrade would make larger sizes available to the HD24. Common limitations on hard
drive sizes for FAT32, HFS, etc. are not applicable. So, in the future, as long as the drive
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