diff --git a/nand.c b/nand.c
index dfde5ab..c3d408c 100644
--- a/nand.c
+++ b/nand.c
@@ -508,7 +508,12 @@ nand_set_a1cr(uint8_t manID, uint8_t deviceID)
 		break;
 	/* Toshiba */
 	case 0x98:
-		AEMIF->A1CR = 0x102442DC;
+		/*
+		 * Factor 10 slower for R/W strobe than the current values. Seems
+		 * to improve stability with mount/rm/umount/mount/write/umount
+		 * cycle. Need to calculate good values based on the datasheet.
+		 */
+		AEMIF->A1CR = 0x20FEE7FC;
 		break;
 	default:
 		log_info( "Unsupported NAND device" );