Yes. It is called JBOD (stands for "Just a Bunch of Drives"). It works as a software driver to treat two HDD units as one, the second simply tacked onto the end of the first. Although a JBOD system is NOT a form of RAID, the driver to do it often is supplied with RAID drivers. The setup and management of a JBOD array often is done in the same place as setting up a RAID array. JBOD often is part of the functions offered on a RAID card, and often also in the RAID capabilities included in a mobo's "built-in" RAID system in its BIOS.
Like most RAID systems, JBOD also has potential problems. The method for doing it is completely non-standard. This means that, if you have a JBOD array working and your controller system (added card or built into the mobo) fails, you would have to find a nearly identical replacement control system to be able to access the data already on those HDD units. You often will find that a different mobo, for example, cannot read those JBOD units and you have lost all their data. So, frequent reliable data backups become essential! If the failure is of one of the HDD units, many of the software tools to recover data from a stand-alone HDD will not know how to handle a JBOD array. Another reason for backups!
In the past, JBOD was used most often to combine two small HDD's to make one large unit. But today's HDD's are so large and fast, many people simply buy a larger HDD.
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