Removable hard disk drive system with circuit for hot insertion and removal responsive to contacts of zero-insertion-force connector on the lateral side of the drive

• US 5,454,080 A
• Filed: 02/10/1992
• Issued: 09/26/1995
• Est. Priority Date: 02/10/1992
• Status: Expired due to Fees

• Current Assignee: International Business Machines Corporation
• Original Assignee: International Business Machines Corporation
• Inventors: Fasig, Jonathan L., Fournier, Thomas R., O'Marro, Kevin P.
• Primary Examiner(s): Lee, Thomas C.
• Assistant Examiner(s): DINH, DUNG C
• Application Number:
  US07/834,072
• Time in Patent Office: 1,324 Days
• Field of Search: 395/275, 360/900, 360/903, 360/99.06, 361/685, 439/285, 439/297
• US Class Current: 710/302
• CPC Class Codes: G11B 25/043 using rotating discs
• CPC Class Codes: G11B 33/02 Cabinets; Cases; Stands; Disposition of apparatus therein or thereon
• CPC Class Codes: G11B 33/122 Arrangements for providing electrical connections, e.g. connectors, cables, switches
• CPC Class Codes: G11B 33/124 of the single recording/reproducing device, e.g. disk drive, onto a chassis

Abstract

A computer system having a removable hard disk drive is disclosed. The interposer card is modified to receive a docking bay which receives a cartridge which contains a hard disk drive. The docking bay includes the male portion of a zero insertion force connector and a first circuit board to which connects to the interposer card of the computer. The first circuit board also includes circuit paths between the male portion of the zero insertion force connector and the end which connects to the interposer card of the computer. The first circuit card also includes circuitry which allows "hot plugging" of the hard disk drive to the bus of the computer and which also acts as a lockout to prevent writing to the removable hard disk drive until after the computer system has been rebooted. The docking bay also includes a spring mechanism for ejecting the cartridge. A finger lever holds the cartridge in place and can be lifted to eject the cartridge. A hard disk drive is placed within a cartridge which includes a second printed circuit board. Attached to the second printed circuit board is the female portion of a zero insertion force connector.

Claims

1. A removable hard disk drive system comprising:

a docking bay which fits within a disk drive bay of a computer, said disk drive bay accommodating a drive, said docking bay having an opening therein with a height, width and depth dimension, said opening in the docking bay having an open end and a closed end, said closed end including a spring plate, a first portion of an electrical connector is positioned along the depth dimension of said opening;

a cartridge which fits within the opening of the docking bay which includes a hard disk drive and a second portion of the electrical connector positioned along a depth dimension of the hard disk drive corresponding to the first portion of the electrical connector, the hard disk drive having dimensions which are less in height, width, and depth dimensions than the corresponding dimensions the disk drive bay, said spring plate contacting said cartridge and urging said cartridge toward said open end of said docking bay; and

hot plugging means for allowing the removal of a first cartridge and the insertion of a second cartridge while power is maintained to the computer system, said hot plugging means operating over a time span between when a first contact is broken and the last contact is broken on the electrical connector as a coupling system is moved between a first position and a second position to break electrical contact and said hot plugging means operating over a time between when a first contact is made and the last contact is made on the electrical connector as the coupling system is moved between a second position and a first position to make electrical contact.

2. The removable hard disk drive system of claim 1 wherein said hot plugging means is provided by electrical devices on one of said first or second circuit cards.

3. The removable hard disk drive system of claim 1 wherein the electrical connector also serves to guide the cartridge into the opening of the docking bay.

4. The removable hard disk drive system of claim 1 wherein the disk drive bay has height, width and depth dimensions associated with a first form factor, the hard disk drive within the cartridge having the dimensions associated with a second form factor which are less in height, width, and depth than the corresponding dimensions of the first form factor.

5. The removable hard disk drive system of claim 1 wherein the coupling system electrically connects the first and the second portions of the electrical connector after the cartridge has been fully inserted into the opening of the docking bay.

6. The removable hard disk drive system of claim 1 wherein the coupling system includes means positioned on an external face of one of the docking bay or the cartridge for moving the coupling system between the first and the second position.

7. The removable hard disk drive system of claim 1 further comprising lockout means for preventing a write to the hard disk drive in a second cartridge after a first cartridge has been replaced by the second cartridge in the opening of the docking bay, said lockout means including indicator means for indicating a cartridge change after the first cartridge has been replaced with the second cartridge.

8. The removable hard disk drive system of claim 7 wherein said indicator means includes a light emitting diode (LED) which remains active until the computer system is rebooted and hard disk write operations can resume.

9. A computer system having a central processing unit capable of sending write commands to a hard disk drive, means for rebooting the computer system, and a removable hard disk drive system which fits within the computer system, said removable hard disk drive system comprising:

a docking bay having a height, a width and a depth dimension,

a cartridge having a height, a width and a depth dimension which fit within said docking bay, said cartridge containing a hard disk drive;

a two part connector wherein one of said parts is electrically connected to and carried along the length of the depth dimension of the docking bay, and the other of said parts is electrically connected to and carried along the length of the depth dimension of the cartridge;

a coupling system means for electrically connecting and disconnecting the parts of the two part connector;

hot plugging means for allowing the removal of a first cartridge and the insertion of a second cartridge while power is maintained to the computer system, said hot plugging means operating over a time span between when a first contact is broken and the last contact is broken on the two part connector as the coupling system is moved between a first position and a second position to break electrical contact and said hot plugging means operating over a time between when a first contact is made and the last contact is made on the two part connector as the coupling system is moved between a second position and a first position to make electrical contact; and

lockout means for preventing the central processing unit of the computer system from writing to the hard disk drive of the removable hard disk drive system after the cartridge has been removed from the docking bay during operation of the computer system, and before rebooting the computer system.

10. The computer system of claim 9 wherein the one and other parts of the two part connector are used to guide the cartridge into the docking bay before electrical connection is made.

11. The computer system of claim 9 further including handle means positioned on an external face of one of the docking bay or the cartridge for moving the coupling system between the first and the second position.

12. The computer system of claim 11 further including holding means for positioning and holding the cartridge within the docking bay independent of the handle means.

13. The computer system of claim 12 wherein said cartridge includes a recess and wherein said holding means includes a lever having an end which hooks into said recess in the cartridge.

14. The computer system of claim 13 further including means for ejecting the cartridge.

15. A method for removing a first disk drive from a computer system and replacing said first disk drive with a second disk drive, said computer system having an electrical connector for coupling one of the disk drives to the computer system, the electrical connector being located along a depth dimension in which the disk drives are inserted into the computer system, said computer system capable of sending write commands to a disk drive and capable of rebooting, said method comprising the steps of:

(a) removing the first disk drive from the computer while power is maintained to the computer;

(b) placing the second disk drive in the computer while power is maintained to the computer by completing an electrical connection of a first and a second portions of the electrical connector in a time span between when a first electrical contact and a last electrical contact is made between the first and the second portions of the electrical connector as the first and the second portions of the electrical connector are mechanically engaged while the second disk drive is placed in the computer; and

(c) preventing the computer system from issuing write commands to the disk drive until after the second disk drive has been placed in the computer system and the computer system has rebooted.