--- nono/vm/scsidev.cpp	2026/04/29 17:04:45	1.1.1.6
+++ nono/vm/scsidev.cpp	2026/04/29 17:04:47	1.1.1.7
@@ -620,6 +620,60 @@ class SCSICmdRead10 : public SCSICmd
 };
 
 //
+// SCSI コマンド 0x2a Write(10) (ダイレクトアクセスデバイス)
+//
+class SCSICmdWrite10 : public SCSICmd
+{
+	using inherited = SCSICmd;
+ public:
+	SCSICmdWrite10(SCSITarget *p) : inherited(p) {
+		hdparent = dynamic_cast<SCSIHD*>(parent);
+	}
+	virtual ~SCSICmdWrite10() override { }
+
+	SCSI::XferPhase Command(std::vector<uint8>& cmdseq) override {
+		// センスデータをクリア
+		parent->ClearSense();
+
+		lba  = cmdseq[2] << 24;
+		lba |= cmdseq[3] << 16;
+		lba |= cmdseq[4] << 8;
+		lba |= cmdseq[5];
+		blks  = cmdseq[7] << 8;
+		blks |= cmdseq[8];
+
+		if (((uint64)lba + (uint64)blks) * parent->GetBlocksize() >
+			hdparent->GetSize())
+		{
+			parent->sensekey = SCSI::SenseKey::IllegalRequest;
+			parent->senseasc = SCSI::ASC::InvalidFieldInCDB;
+			status_byte = SCSI::StatusByte::CheckCondition;
+			return SCSI::XferPhase::Status;
+		}
+
+		// 平均シークタイム
+		optime = hdparent->seektime;
+
+		recvbytes = blks * parent->GetBlocksize();
+		return SCSI::XferPhase::DataOut;
+	}
+
+	SCSI::XferPhase DoneDataOut() override {
+		parent->putlog(1, "WRITE10 LBA=0x%x blks=0x%x", lba, blks);
+		if (hdparent->writeprotect == false) {
+			memcpy(hdparent->mem + (lba * parent->GetBlocksize()),
+				buf.data(), buf.size());
+		}
+		return SCSI::XferPhase::Status;
+	}
+
+ private:
+	SCSIHD *hdparent;
+	uint32 lba;
+	uint32 blks;
+};
+
+//
 // SCSI コマンド サポートしていないコマンド
 //
 class SCSICmdNotSupportedCommand : public SCSICmd
@@ -1043,6 +1097,10 @@ SCSIHD::DispatchCmd()
 		cmd.reset(new SCSICmdRead10(this));
 		break;
 
+	 case SCSI::Command::Write10:		// 0x2a
+		cmd.reset(new SCSICmdWrite10(this));
+		break;
+
 	 default:
 		// 見付からなければ基本クラス側に任せる
 		inherited::DispatchCmd();