diff --git a/flashchips.c b/flashchips.c
index 0d85142..1d45810 100644
--- a/flashchips.c
+++ b/flashchips.c
@@ -16329,7 +16329,45 @@
 		.read		= read_memmapped,
 		.voltage	= {3000, 3600}, /* Also has 12V fast program */
 	},
-	
+
+	{
+		.vendor         = "Zetta Device",
+		.name           = "ZD25D40",
+		.bustype        = BUS_SPI,
+		.manufacture_id = ZETTADEVICE_ID,
+		.model_id       = ZETTADEVICE_ZD25D40,
+		.total_size     = 512,
+		.page_size      = 256,
+		.feature_bits   = FEATURE_WRSR_WREN,
+		.tested         = TEST_UNTESTED,
+		.probe          = probe_spi_rdid,
+		.probe_timing   = TIMING_ZERO,
+		.block_erasers  =
+		{
+			{
+				.eraseblocks = { {4 * 1024, 128} },
+				.block_erase = spi_block_erase_20,
+			}, {
+				.eraseblocks = { {32 * 1024, 16} },
+				.block_erase = spi_block_erase_52,
+			}, {
+				.eraseblocks = { {64 * 1024, 8} },
+				.block_erase = spi_block_erase_d8,
+			}, {
+				.eraseblocks = { {512 * 1024, 1} },
+				.block_erase = spi_block_erase_60,
+			}, {
+				.eraseblocks = { {512 * 1024, 1} },
+				.block_erase = spi_block_erase_c7,
+			}
+		},
+		.printlock      = spi_prettyprint_status_register_plain, /* TODO: improve */
+		.unlock         = spi_disable_blockprotect,
+		.write          = spi_chip_write_256,
+		.read           = spi_chip_read,
+		.voltage        = {2700, 3600},
+	},
+
 	{
 		.vendor		= "Unknown",
 		.name		= "SFDP-capable chip",
diff --git a/flashchips.h b/flashchips.h
index f487248..8c07628 100644
--- a/flashchips.h
+++ b/flashchips.h
@@ -957,4 +957,7 @@
 #define WINBOND_W49V002A	0xB0
 #define WINBOND_W49V002FA	0x32
 
+#define ZETTADEVICE_ID          0xBA	/* Zetta Device */
+#define ZETTADEVICE_ZD25D40     0x2013
+
 #endif /* !FLASHCHIPS_H */