Typical Hard Drive Jumper Options
Below you will find three images that detail Jumper Options for Seagate and Maxtor drives plus a brief explanation...
 
 
 

Figure-1a and -1b show two examples of how Maxtor has implemented the 4092 cylinder limit feature to make the 40gig drive compatible for Masterlink and Older PCs.  Figure-1c shows the Seagate version...


Figure-1a: Maxtor Drive Configuration Options.
The "4092 cylinder limit" jumper is key to masterlink success.

NOTE: Maxtor is not consistent in their Jumper implementation. 
Please consult the drive documentation for your model.



.
Figure-1b: Alternate Jumper Settings plus connection basics

NOTE: Maxtor is not consistent in their Jumper implementation. 
Please consult the drive documentation for your model.



Figure-1c: Jumper Options 
for Seagate's ST340823A and the ST340810A 40 GB drives


DRIVE NOTE:  Alternate Capacity Jumper

Some older computers as well as the Alesis Masterlink may "hang" or display jibberish if the BIOS detects hard drives with more than 4092 cylinders or approximately 33.8 GB (32GB).  The 40GB drives in question typically have 16,383 cylinders!  At the UBER GEEK level, the drive reports its status via "words" 60 and 61, the alternate capacity jumper sets the "default translation geometry" to 4,092 cylinders limiting the apparent capacity of the ST340810A and the ST340823A drives to 33.8GB (32GB) by "freezing" the status words at a value below the problem barrier point. 

However, the ATA feature set includes the sub-command "F1h" to Report Full Capacity and then fill in the "real" value of words 60 and 61 after the BIOS scan and once the Operating System (OS) takes over.

As an example, while the computer hardware may not support or report the full size of the drive,  Windows 98 and newer operating systems interrogate the drive a second time using the F1h command to take full advantage of the drive's capacity.

40GB is over 10-times the space originally shipped with Masterlink and twice the supported drive size.  No one with the 40GB drive upgrade has actually found whether or not there are actually limitations, such as the number of playlists, or "songs" or total contiguous recording time.

Good Luck!

Return to Alesis Masterlink Article...