Disk drive unit overheating warning system

• US 5,115,225 A
• Filed: 11/13/1990
• Issued: 05/19/1992
• Est. Priority Date: 11/13/1990
• Status: Expired due to Term

• Current Assignee: Hewlett-Packard Development Company, L.P. (HP Inc.)
• Original Assignee: Compaq Computer Corporation (HP Inc.)
• Inventors: Dao, Hung D., Ewert, Richard, Thomas, Darren R., Grieff, Thomas W., Schultz, Stephen M., Flower, David L., Lattin, Thomas W. Jr.
• Primary Examiner(s): Swann, III, Glen R.
• Application Number:
  US07/612,133
• Time in Patent Office: 553 Days
• Field of Search: 340/584, 340/588, 340/653, 364/185, 371/14
• US Class Current: 340/584
• CPC Class Codes: G11B 33/10 Indicating arrangements; Warning arrangements G11B15/04, G11B19/04, G11B27/34, G11B27/36 take precedence
• CPC Class Codes: G11B 33/144 by detection, control, regulation of the temperature

Abstract

Temperature sensors are located inside drive chambers where disk drives are located to signal an overheating condition. An overheating condition triggers external alarms and produces an interrupt signal to the disk drive controller, which, in turn, alerts the operating system. If the operating system does not comprehend the problem and take the appropriate action, the controller shuts down the disk drives after a certain period of time.

Claims

1. An apparatus for detecting overheating in a disk drive chamber, the disk drive chamber including one or more disk drives, the disk drives coupled to a disk drive controller which is in communication with an operating system, the apparatus comprising:

means located in the drive chamber for sensing the temperature in the drive chamber and generating a signal indicative thereof;

comparing means coupled to said temperature sensing means which receives said temperature indicating signal for determining if the drive chamber temperature is above a limit temperature indicative of overheating and for generating a signal indicative thereof;

an external indicating alarm;

means coupled to said comparing means which receives said limit indicating signal and generates an interrupt signal; and

means on the disk drive controller coupled to said external indicating alarm and said interrupt signal generating means and receiving said interrupt signal for triggering said external indicating alarm and communicating the overheating status to the operating system when said overheating is detected.

2. The apparatus of claim 1, wherein said disk drive controller further includes:

an overheating duration timer which counts a predetermined period of time;

means coupled to said overheating duration timer and said interrupt signal generating means for beginning said timer when said interrupt signal is asserted; and

means coupled to said overheating duration timer and the disk drives for disabling the disk drives if said interrupt signal continues until said predetermined period of time has elapsed.

3. The apparatus of claim 2, wherein said disk drive controller further includes:

means coupled to said overheating duration timer and said interrupt signal generating means for resetting said overheating duration timer if said interrupt signal is negated.

4. The apparatus of claim 2, wherein said disk drive controller flashes said external indicating alarm while said overheating duration timer is counting;

and

wherein said disk drive controller continuously asserts said external indicating alarm when said predetermined period of time has elapsed.

5. The apparatus of claim 4, wherein said external indicating alarm comprises a beeper and at least one light emitting diode.

6. The apparatus of claim 1, wherein said comparing means further determines if the drive chamber temperature is above a second limit temperature, said second limit temperature being greater than said first-recited limit temperature, and generates a signal indicative thereof;

the apparatus further comprising;

power supply means which supplies power to the disk drives having an input for receiving said second limit temperature indicating signal, wherein said power supply means is disabled when said drive chamber temperature is above said second temperature as indicated by said second limit temperature indicating signal.

7. An apparatus for detecting overheating in a device chamber, the device chamber including one or more devices, the devices coupled to a device controller which is in communication with an operating system, the apparatus comprising:

means located in the device chamber for sensing the temperature in the device chamber and generating a signal indicative thereof;

comparing means coupled to said temperature sensing means which receives said temperature indicating signal for determining if the device chamber temperature is above a limit temperature indicative of overheating and for generating a signal indicative thereof;

means coupled to said comparing means which receives said limit indicating signal and generates an interrupt signal; and

means on the device controller coupled to said interrupt signal generating means and receiving said interrupt signal for communicating the overheating status to the operating system when said overheating is detected.

8. The apparatus of claim 7, further comprising:

an external indicating alarm;

wherein said device controller means is coupled to said external indicating alarm and triggers said external indicating alarm when said overheating is detected.