Thus, you can plug it directly into your computer to use. However, the USB external hard drive usually needs a matching cable to connect it to your computer. Of course, the cable uses USB Type-A or USB Type-C interface, too. Then, you may think of external SSDs. They are very like external hard drives (Both them are external drives and that's why I classify external SSDs into external hard drives, not into the flash drive category). The real topic of this post can be regarded as extanl HDD & SSD vs flash drive.
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How to choose between them? Please keep reading. Tip: As NAND technology improves, the number of flash memory chips mounted on SSDs decreases without reducing capacity. This is also one of the reasons why the capacity of flash drives is getting larger and larger. In general, the performance of external hard drives is better than that of flash drives. If comparing external HDDs and flash drives, as normal, external hard drives are much faster in bulk data transfer while USB flash drives may be faster when transferring small bits of data. However, when it comes to the performance of flash drive vs. external SSD, flash drives have no advantages. There are mainly 4 reasons as to why flash drives perform worse than external SSDs.ġ. Transport protocols: If you search in Amazon, you'll find there are still many USB flash drives using USB 2.0 protocol, while most of external hard drives have switched to using USB 3.0 protocol. USB 2.0 has a maximum transmission bandwidth of 480 Mbps, namely 60 MB/s, while USB 3.0 has a maximum transmission bandwidth of up to 5.0 Gbps, namely 500 MB/s.Ģ. Master control: Like SSDs, external SSDs use master controls with excellent quality, while USB flash drives usually use master controls with bad quality. In general, in order to improve read and write speed, SSDs and external SSDs usually adopt multi-channel mode, which allows master control to operate multiple flash memory chips in parallel through several channels (just like RAID 0). SSD master control can allow SSDs to increase the number of parallel channels to 4 or up to 8. However, flash drive master control usually supports 1 or 2 channels. On the other hand, the USB main control lacks some important technologies, which will affect USB performance and lifespan.
These technologies include TRIM, wear leveling, etc. Without TRIM technology, the USB flash drive writing speed will become slower and slower.ģ. SLC means that each storage unit can store 1 bit of data MLC means 2 bits TLC means 3 bits.įlash particles: As we all know, there are currently three main types of flash memory particles: SLC, MLC, and TLC.
On the one hand, storing more data in each unit allows manufacturers to create larger-capacity products with fewer flash memory chips on the other hand, this will slow products' speed.įlash drives usually use TLC, while external SSDs usually use MLC or even SLC.Ĥ. Cache: Cache is actually a DRAM memory chip that is used to balance the speed differences between high-speed and low-speed devices, for example, memory and hard disk.
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