Hybrid-device storage based on environmental state

A hybrid storage device, comprising:

• a hard-disk drive (HDD);
• a flash memory;
• an interface circuit;
• and
• control logic, electrically coupled to the HDD, the flash memory, and the interface circuit, wherein the control logic is configured to:
• receive a request from an external device to write a block of data to the hybrid storage device, wherein the request includes a logical address for the block of data in a first portion of an address space which maps to the HDD;
• in response to the request, write the block of data to the HDD;
• and
• if there is a change in an operating state of the HDD in which failure or shut down of the HDD is to occur during the write operation, write at least a portion of the block of data to a logical address for the block of data in a second portion of the address space which maps to the flash memory, wherein the address space is common to the external device and the hybrid storage device.

A hybrid storage device, comprising:

• a hard-disk drive (HDD);
• a flash memory;
• an interface circuit;
• and
• control logic, electrically coupled to the HDD, the flash memory, and the interface circuit, the control logic is configured to:
• receive a request from an external device to read a block of data from the hybrid storage device, wherein the request includes a logical address for the block of data in a first portion of an address space which maps to the HDD;
• and
• in response to the request, accessing the block of data at a logic address which maps to the flash memory if the HDD is inoperative due to an environmental condition and the block of data is stored on the flash memory.

A computer system, comprising:

• a processor;
• a memory;
• and
• a hybrid storage device, the hybrid storage device including:
• an HDD;
• a flash memory;
• an interface circuit;
• and
• control logic, electrically coupled to the HDD, the flash memory, and the interface circuit, wherein the control logic is configured to:
• receive a request from an external device to write a block of data to the hybrid storage device, wherein the request includes a logical address for the block of data in a first portion of an address space which maps to the HDD;
• in response to the request, write the block of data to the HDD;
• and
• if there is a change in environmental state information of the hybrid storage device during the write operation, write at least a portion of the block of data to a logical address for the block of data in a second portion of the address space which maps to the flash memory, wherein the address space is common to the external device and the hybrid storage device.

A method for writing a block of data to a hybrid storage device, which includes an HDD and a flash memory, the method comprising:

• receiving a request from an external device to write the block of data to the hybrid storage device, wherein the request includes a logical address for the block of data in a first portion of an address space which maps to the HDD;
• in response to the request, writing the block of data to the HDD;
• and
• if there is a change in environmental state information of the hybrid storage device during the write operation, writing at least a portion of the block of data to a logical address for the block of data in a second portion of the address space which maps to the flash memory, wherein the address space is common to the external device and the hybrid storage device.