This is "SSD Doujinshi 4". I obtained this at Maker Faire Tokyo 2025, held in October 2025. I've only read it once. First edition, first printing, October 4, 2025 Table of Contents AI Papa: On the Publication of SSD Doujinshi Issue 4...3 Katsuyuki Toda: Data Center Overload...4 ragnag: Behind the Scenes of Storage Solutions Supporting AI...13 J: What Kind of Place is Ofuna?...15 Kanmika: Introducing the KIOXIA LC9 Series...16 Kento Tateno: The Story of KIOXIA AiSAQ™...19 Imo: Building a Raspberry Pi File Server Using KIOXIA SSD...22 Nichika: Artificial Intelligence Created by Reading and Writing Flash Memory...25 Shinro Ito: Optical SSD...30 Jim: Broadband Optical SSD...32 Hatto: Consumer SSD Lineup and Recommended Models...36 Yonetsu: Exhibiting at Interop Tokyo 2025...38 Pochio: Exhibiting at Maker Faire Tokyo 2024 and New Encounters...40 wipeseals: Accelerating NAND Flash Memory Control of JISC-SSD with PIO...46 Miyauchi: He Who Controls the Cache, Controls the Flash Memory!...50 Shingo Fukuya: microSD Express in M.2! "PC-SEM2"...54 Kazushi Yoshida: Let's Make JISC-SSD Do Image Processing...56 @isariyokurari: Visible SSD with an Erase Button...60 Hideki Yamada: Let's Make a Rounding Theremin...62 Baimu: Introduction to the SCA Protocol...66 J: Organization and Arrangement!...70