diff --git a/kernel-src/io/block/ahci.c b/kernel-src/io/block/ahci.c
index e2518c4b..4698bb7b 100644
--- a/kernel-src/io/block/ahci.c
+++ b/kernel-src/io/block/ahci.c
@@ -133,9 +133,16 @@ typedef struct {
 typedef struct {
 	uint16_t ignore0[100];
 	uint16_t lba48_size[4];
-	uint16_t ignore1[152];
+	uint16_t ignore1[2];
+	uint16_t sector_size_info;
+	uint16_t ignore2[10];
+	uint16_t logical_sector_size[2];
+	uint16_t ignore3[137];
 } identify_t;
 
+#define IDENTIFY_SECTOR_SIZE_VALID(x) (((x) & (1 << 14)) && (((x) & (1 << 15)) == 0))
+#define IDENTIFY_LOGICAL_SECTOR_LONGER (1 << 12)
+
 struct ahci_t;
 typedef struct {
 	struct ahci_t *ahci;
@@ -159,8 +166,8 @@ typedef struct ahci_t {
 } ahci_t;
 
 #define FOR_EACH_PORT(ahci) \
-	for (int i = 0, _pi = (ahci)->implemented_ports; _pi; i++, _pi >>= 1) \
-		if (_pi & 1)
+	for (int i = 0; i < 32; ++i) \
+		if ((ahci)->implemented_ports & (1u << i))
 
 void ahci_dpc(context_t *, dpcarg_t arg) {
 	port_data_t *port_data = arg;
@@ -430,6 +437,19 @@ static void init_port(ahci_t *ahci, int port) {
 		return;
 	}
 
+	uint64_t logical_sector_size = 512;
+	if (IDENTIFY_SECTOR_SIZE_VALID(identify->sector_size_info) && (identify->sector_size_info & IDENTIFY_LOGICAL_SECTOR_LONGER)) {
+		uint32_t logical_sector_words = identify->logical_sector_size[0] |
+			((uint32_t)identify->logical_sector_size[1] << 16);
+		logical_sector_size = logical_sector_words * sizeof(uint16_t);
+	}
+
+	if (logical_sector_size != 512) {
+		printf("ahci%dp%d: unsupported logical sector size %lu\n", ahci->id, port, logical_sector_size);
+		pmm_release(identify_phys);
+		return;
+	}
+
 	ahci->port_data[port]->sector_count = (uint64_t)identify->lba48_size[0] | ((uint64_t)identify->lba48_size[1] << 16) |
 				((uint64_t)identify->lba48_size[2] << 32) | ((uint64_t)identify->lba48_size[3] << 48);
 	pmm_release(identify_phys);
diff --git a/recipes/astral b/recipes/astral
index a738d414..2bc4f515 100644
--- a/recipes/astral
+++ b/recipes/astral
@@ -1,5 +1,5 @@
 name=astral
-revision=6
+revision=7
 from_source=astral
 imagedeps="build-essential nasm"
 hostdeps="xgcc xbinutils limine"