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Comparison of NAND-based SSD and HDD Attribute or characteristic Solid-state drive (SSD) Hard disk drive (HDD) Price per capacity SSDs are generally more expensive than HDDs and are expected to remain so. As of early 2018, SSD prices were around $0.30 per gigabyte for 4 TB models. [23]
An SSD, in form of a 2.5-inch bay device that uses Serial ATA (SATA) interface Internals of an SD card , showing the flash memory and controller integrated circuits A solid-state drive (SSD) provides secondary storage for relatively complex systems including personal computers , embedded systems , portable devices , large servers and network ...
The first HDD [11] had an average seek time of about 600 ms. [12] and by the middle 1970s, HDDs were available with seek times of about 25 ms. [13]Some early PC drives used a stepper motor to move the heads, and as a result had seek times as slow as 80–120 ms, but this was quickly improved by voice coil type actuation in the 1980s, reducing seek times to around 20 ms.
Compared to hard disk drives and similar electromechanical disk storage that use moving physical parts to spin a platter or disc, SSDs are typically more compact, quieter, more resistant to physical shock, and have higher input/output rates, lower latency [13] and less power consumption.
APM defines five power states for the computer system: Full On: The computer is powered on, and no devices are in a power saving mode. APM Enabled: The computer is powered on, and APM is controlling device power management as needed. APM Standby: Most devices are in their low-power state, the CPU is slowed or stopped, and the system state is saved.
An example of an often confused dual-drive system being considered an SSHD is the use of laptops which combine separate SSD and HDD components into the same 2.5-inch HDD-size unit, while at the same time (unlike SSHDs) keeping these two components visible and accessible to the operating system as two distinct partitions.
SSD ~5,000 IOPS [14] SATA 3 Gbit/s Intel's data sheet [15] claims 3,300 IOPS and 35,000 IOPS for writes and reads, respectively. 5,000 IOPS are measured for a mix. Intel X25-E G1 has around 3 times higher IOPS compared to the Intel X25-M G2. [16] G.Skill Phoenix Pro SSD ~20,000 IOPS [17] SATA 3 Gbit/s
Power-on hours is intended to indicate a remaining lifetime prediction for hard drives and solid state drives, generally, "the total expected life-time of a hard disk is 5 years" [3] or 43,800 hours of constant use. [4] [5] Typically, after a disk reaches 5 years of power-on time, the disk is more likely to fail.