Abstract: According to one embodiment, a memory system includes a nonvolatile memory and a controller. The controller receives a first write request associated with first data from a host. In response to a lapse of first time since the reception of the first write request, the controller starts a write process of second data to the nonvolatile memory. The second data includes at least the first data. The controller transmits a first response to the first write request to the host in response to completion of the write process. The first time is time obtained by subtracting second time from third time designated by the host as a time limit of the transmission of the first response since the reception of the first write request.

Abstract: A heat exchanger of this invention used as a radiator for an automotive vehicle has a core plate having a holding groove around its periphery for receiving a seal member as well as a flange of a tank member, wherein a concave-convex portion is formed in the outer surface of the outer or inner side wall forming the holding groove. According to this structure, an excess molten solder is gathered toward the concave-convex portion when the core plate is heated for soldering in a heat furnace. This prevents the excess solder from making a drop-shaped mass which has an adverse influence on a seal efficiency of the seal member.