diff --git a/flashchips.c b/flashchips.c
index 1d45810..1ab4986 100644
--- a/flashchips.c
+++ b/flashchips.c
@@ -16332,6 +16332,44 @@
 
 	{
 		.vendor         = "Zetta Device",
+		.name           = "ZD25D20",
+		.bustype        = BUS_SPI,
+		.manufacture_id = ZETTADEVICE_ID,
+		.model_id       = ZETTADEVICE_ZD25D20,
+		.total_size     = 256,
+		.page_size      = 256,
+		.feature_bits   = FEATURE_WRSR_WREN,
+		.tested         = TEST_UNTESTED,
+		.probe          = probe_spi_rdid,
+		.probe_timing   = TIMING_ZERO,
+		.block_erasers  =
+		{
+			{
+				.eraseblocks = { {4 * 1024, 64} },
+				.block_erase = spi_block_erase_20,
+			}, {
+				.eraseblocks = { {32 * 1024, 8} },
+				.block_erase = spi_block_erase_52,
+			}, {
+				.eraseblocks = { {64 * 1024, 4} },
+				.block_erase = spi_block_erase_d8,
+			}, {
+				.eraseblocks = { {256 * 1024, 1} },
+				.block_erase = spi_block_erase_60,
+			}, {
+				.eraseblocks = { {256 * 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         = "Zetta Device",
 		.name           = "ZD25D40",
 		.bustype        = BUS_SPI,
 		.manufacture_id = ZETTADEVICE_ID,
diff --git a/flashchips.h b/flashchips.h
index 8c07628..452f776 100644
--- a/flashchips.h
+++ b/flashchips.h
@@ -958,6 +958,7 @@
 #define WINBOND_W49V002FA	0x32
 
 #define ZETTADEVICE_ID          0xBA	/* Zetta Device */
+#define ZETTADEVICE_ZD25D20     0x2012
 #define ZETTADEVICE_ZD25D40     0x2013
 
 #endif /* !FLASHCHIPS_H */