Reset disk system on read error

ponydos.asm

@@ -214,8 +214,10 @@ read_sector:
 	; es:bx = output buffer
 	mov bx, di
 
+	.retry:
 	mov ax, 0x0201 ; read one sector
 	int 0x13
+	jc .error
 
 	pop dx
 	pop cx
@@ -223,6 +225,14 @@ read_sector:
 	pop ax
 	ret
 
+	.error:
+		; Reset the disk system unconditinoally, as we have no
+		; kernel panic handler to go to after 3 tries and proper
+		; error handling would take too much code
+		xor ah, ah
+		int 0x10
+		jmp .retry
+
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