diff --git a/sys/lib/libsa/ext2fs.c b/sys/lib/libsa/ext2fs.c
index b810947fdaf5..007c732dfacf 100644
--- a/sys/lib/libsa/ext2fs.c
+++ b/sys/lib/libsa/ext2fs.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: ext2fs.c,v 1.30 2022/04/19 09:25:38 skrll Exp $	*/
+/*	$NetBSD: ext2fs.c,v 1.31 2022/04/24 06:48:15 mlelstv Exp $	*/
 
 /*
  * Copyright (c) 1997 Manuel Bouyer.
@@ -415,9 +415,15 @@ read_sblock(struct open_file *f, struct m_ext2fs *fs)
 	struct ext2fs ext2fs;
 	size_t buf_size;
 	int rc;
+	u_int secsize;
+
+	secsize = 0;
+	rc = DEV_IOCTL(f->f_dev)(f, SAIOSECSIZE, &secsize);
+	if (rc != 0 || secsize == 0)
+		secsize = DEV_BSIZE;
 
 	rc = DEV_STRATEGY(f->f_dev)(f->f_devdata, F_READ,
-	    SBOFF / DEV_BSIZE, SBSIZE, sbbuf, &buf_size);
+	    SBOFF / secsize, SBSIZE, sbbuf, &buf_size);
 	if (rc)
 		return rc;
 
diff --git a/sys/lib/libsa/minixfs3.c b/sys/lib/libsa/minixfs3.c
index e1622c2e6236..9903f12d4fd2 100644
--- a/sys/lib/libsa/minixfs3.c
+++ b/sys/lib/libsa/minixfs3.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: minixfs3.c,v 1.9 2022/04/19 09:25:38 skrll Exp $	*/
+/*	$NetBSD: minixfs3.c,v 1.10 2022/04/24 06:48:15 mlelstv Exp $	*/
 
 /*-
  * Copyright (c) 2012
@@ -449,6 +449,7 @@ read_sblock(struct open_file *f, struct mfs_sblock *fs)
 	static uint8_t sbbuf[MINBSIZE];
 	size_t buf_size;
 	int rc;
+	u_int secsize;
 
 	/* We must read amount multiple of sector size, hence we can't
 	 * read SBSIZE and read MINBSIZE.
@@ -456,8 +457,13 @@ read_sblock(struct open_file *f, struct mfs_sblock *fs)
 	if (SBSIZE > MINBSIZE)
 		return EINVAL;
 
+	secsize = 0;
+	rc = DEV_IOCTL(f->f_dev)(f, SAIOSECSIZE, &secsize);
+	if (rc != 0 || secsize == 0)
+		secsize = DEV_BSIZE;
+
 	rc = DEV_STRATEGY(f->f_dev)(f->f_devdata, F_READ,
-	    SUPER_BLOCK_OFF / DEV_BSIZE, MINBSIZE, sbbuf, &buf_size);
+	    SUPER_BLOCK_OFF / secsize, MINBSIZE, sbbuf, &buf_size);
 	if (rc)
 		return rc;
 
diff --git a/sys/lib/libsa/saioctl.h b/sys/lib/libsa/saioctl.h
index 8b0198a6a3c8..9b0fa68b1b7d 100644
--- a/sys/lib/libsa/saioctl.h
+++ b/sys/lib/libsa/saioctl.h
@@ -1,4 +1,4 @@
-/*	$NetBSD: saioctl.h,v 1.4 2005/12/11 12:24:46 christos Exp $	*/
+/*	$NetBSD: saioctl.h,v 1.5 2022/04/24 06:48:15 mlelstv Exp $	*/
 
 /*-
  * Copyright (c) 1993
@@ -46,3 +46,5 @@
 #define	SAIOSSDEV	(('d'<<8)|12)	/* is device skip sector type? */
 #define	SAIODEBUG	(('d'<<8)|13)	/* enable/disable debugging */
 #define	SAIOGBADINFO	(('d'<<8)|14)	/* get bad-sector table */
+
+#define SAIOSECSIZE	(('d'<<8)|15)	/* get sector size */
diff --git a/sys/lib/libsa/ufs.c b/sys/lib/libsa/ufs.c
index df0e5a7b475d..8a8a328a96ac 100644
--- a/sys/lib/libsa/ufs.c
+++ b/sys/lib/libsa/ufs.c
@@ -1,4 +1,4 @@
-/*	$NetBSD: ufs.c,v 1.81 2022/04/19 09:25:38 skrll Exp $	*/
+/*	$NetBSD: ufs.c,v 1.82 2022/04/24 06:48:15 mlelstv Exp $	*/
 
 /*-
  * Copyright (c) 1993
@@ -594,13 +594,21 @@ ffs_find_superblock(struct open_file *f, FS *fs)
 	struct file *fp = (struct file *)f->f_fsdata;
 	int rc;
 	size_t buf_size;
+	u_int secsize;
 #ifdef LIBSA_FFSv2
 	static daddr_t sblock_try[] = SBLOCKSEARCH;
 	int i;
+#endif
 
+	secsize = 0;
+	rc = DEV_IOCTL(f->f_dev)(f, SAIOSECSIZE, &secsize);
+	if (rc != 0 || secsize == 0)
+		secsize = DEV_BSIZE;
+
+#ifdef LIBSA_FFSv2
 	for (i = 0; sblock_try[i] != -1; i++) {
 		rc = DEV_STRATEGY(f->f_dev)(f->f_devdata, F_READ,
-		    sblock_try[i] / DEV_BSIZE, SBLOCKSIZE, fs, &buf_size);
+		    sblock_try[i] / secsize, SBLOCKSIZE, fs, &buf_size);
 		if (rc)
 			return rc;
 		if (buf_size != SBLOCKSIZE)
@@ -615,7 +623,7 @@ ffs_find_superblock(struct open_file *f, FS *fs)
 	return EINVAL;
 #else /* LIBSA_FFSv2 */
 	rc = DEV_STRATEGY(f->f_dev)(f->f_devdata, F_READ,
-		SBLOCKOFFSET / DEV_BSIZE, SBLOCKSIZE, fs, &buf_size);
+		SBLOCKOFFSET / secsize, SBLOCKSIZE, fs, &buf_size);
 	if (rc)
 		return rc;
 	if (buf_size != SBLOCKSIZE)