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Cartridge ESD discharge during drive loading in a storage system

IP.com Disclosure Number: IPCOM000014998D
Original Publication Date: 2001-Aug-29
Included in the Prior Art Database: 2003-Jun-20
Document File: 3 page(s) / 78K

Publishing Venue

IBM

Abstract

In a storage library system a cartridge can build up a charge of 8 to 12 KV while being unloaded from a storage bin, or when an operator moves a cartridge across a non anti-static room from a shelf to a drive for manual loading. Although the picker and/or the drive can be grounded, the build up charge cannot be bled to ground fast enough without affecting the electronic circuitry of other units in the system. Signal voltage spikes of up to 7 Volts on the ground system have been seen when the a charged cartridge contacts the drive loader tray whether manually or via the picker. These type of spikes although narrow can still affect other units in the system while writing or reading. The read/write circuitry, and channel circuitry can be affected and can cause non recoverable errors, which in turn can bring the system to a halt, and a reboot or IML of the entire system becomes necessary, this then becomes very annoying to users.

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Cartridge ESD discharge during drive loading in a storage system

    In a storage library system a cartridge can build up a charge of 8 to 12 KV while being unloaded from a storage bin, or when an operator moves a cartridge across a non anti-static room from a shelf to a drive for manual loading. Although the picker and/or the drive can be grounded, the build up charge cannot be bled to ground fast enough without affecting the electronic circuitry of other units in the system. Signal voltage spikes of up to 7 Volts on the ground system have been seen when the a charged cartridge contacts the drive loader tray whether manually or via the picker. These type of spikes although narrow can still affect other units in the system while writing or reading. The read/write circuitry, and channel circuitry can be affected and can cause non recoverable errors, which in turn can bring the system to a halt, and a reboot or IML of the entire system becomes necessary, this then becomes very annoying to users.

The solution consist of mounting conductive roller/s directly grounded to the picker, and system frame, a picker could have 2 grippers, in this case 2 rollers are required one for the top and one for the bottom. In case of manual system mount the conductive roller on the drive opening of the loader tray directly grounded to the system frame via a braided wire for a faster bleeding response, see figure 1 and 2. When the cartridge is loaded into the drive, the roller will dischar...