Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
316 words
In a hierarchial memory system made up of a plurality of levels in the hierarchy including a lowest level containing a tape system and a next to lowest level containing disc units, each level with its own data store having a plurality of storage locations for storing data at that level in the hierarchy, an improvement in the means of copying back by a copy back order, into the disc units and tape system of the next to lowest and the lowest levels of the hierarchy, changes of addition or modification made in data stored in the hierarchy by instruction from a processing unit compressing: a plurality of said disc units in the next to lowest level each with a plurality of actuators each accessing an area of the disc unit, said actuators each being accessible for operation through a plurality of stations, an archival tape system on the lowest level containing a plurality of tapes said archival system having a plurality of stations each capable of reading or writing data in all said tapes in said archival tape system, two independently operating loops, one loop joining in series one of the plurality of stations in each of the disc units and the tape system and the other loop forming in series a different one of the plurality of stations in each of the disc units and the tape system, separate powering means for powering the two loops independently of one another, and copy back area means in each of two separate ones of said plurality of said disc units, each said copy back area means for containing changes in data stored only in disc units other than the one containing the particular copy back area means whereby loss of one of the powering means does not prevent copying back of data to the tape and disc units using the loop with the operating power supply.
Claim 2
Dependent Claim
316 words
In a hierarchial memory system made up of a plurality of levels in the hierarchy including a lowest level containing a tape system and a next to lowest level containing disc units, each level with its own data store having a plurality of storage locations for storing data at that level in the hierarchy, an improvement in the means of copying back by a copy back order, into the disc units and tape system of the next to lowest and the lowest levels of the hierarchy, changes of addition or modification made in data stored in the hierarchy by instruction from a processing unit compressing: a plurality of said disc units in the next to lowest level each with a plurality of actuators each accessing an area of the disc unit, said actuators each being accessible for operation through a plurality of stations, an archival tape system on the lowest level containing a plurality of tapes said archival system having a plurality of stations each capable of reading or writing data in all said tapes in said archival tape system, two independently operating loops, one loop joining in series one of the plurality of stations in each of the disc units and the tape system and the other loop forming in series a different one of the plurality of stations in each of the disc units and the tape system, separate powering means for powering the two loops independently of one another, and copy back area means in each of two separate ones of said plurality of said disc units, each said copy back area means for containing changes in data stored only in disc units other than the one containing the particular copy back area means whereby loss of one of the powering means does not prevent copying back of data to the tape and disc units using the loop with the operating power supply.
Claim 3
Dependent Claim
44 words
The hierarchial memory system of claim 1 wherein said archival tape system includes means for duplicating all the data stored in said archival tape system on two separate tapes of said plurality of tapes when said data is placed in said archival tape system.
Claim 4
Dependent Claim
21 words
The hierarchial memory system of claim 1 including buffering means for accumulating changes to be placed into the copy back areas.
Claim 5
Dependent Claim
47 words
The hierarchial memory system of claim 3 including means for placing said changes into the buffer in the order in which the data modified by any one of said changes was first modified by any such change that has not been copied into the archival tape system.
Claim 6
Dependent Claim
34 words
The hierarchial memory system of claim 3 including means for providing an additional bit of data in entries to the copy back areas to indicate whether or not said entries are valid or not.