Multi-layer transformed MDS codes achieve sub-packetization (d-k+1)^⌈n/((d-k+1)η)⌉ with optimal single-node repair access by restricting helper node choices, below the prior lower bound when η>1.
A Unified Form of EVENODD and RDP Codes and Their Efficient Decoding,
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Multi-Layer Transformed MDS Codes with Optimal Repair Access and Low Sub-Packetization
Multi-layer transformed MDS codes achieve sub-packetization (d-k+1)^⌈n/((d-k+1)η)⌉ with optimal single-node repair access by restricting helper node choices, below the prior lower bound when η>1.