By Andreas Lee

USB hard drives are generally known as external hard drives. Because of market demand, this external media manufactured by more and more companies which are well-known with their famous product technology in the world, such as Toshiba, Sony, and Hitachi, compete with large manufacturing hard drives companies with latest USB hard drives innovations such as Maxtor, Seagate, Western Digital and LaCie.

It has to be known that recently USB hard drives market is dominated by Seagate and Maxtor, especially when this two big hard drive companies collaborated to create USB hard drives Network Attach Storage (NAS) namely Seagate Maxtor Shared Storage II which contains 2 unit 500 GB hard drives inside it.

Please note that the smallest USB hard drives NAS server capacity is 320 GB which is counted as a pretty large capacity for common external hard drives. There are multiple hard drives which organized by RAID technology within it. RAID technology is the technology that allows multiple hard drives to store data in the same vessel.

Seagate BlackArmor NAS 440

Seagate create new innovation by launching Seagate BlackArmor NAS 420 which has 2 slots for internal hard drives and Seagate BlackArmor NAS 440 which has 4 slots.

usb external hard drive

Seagate BlackArmor NAS 440 allows you to attach 4 pieces 2 TB internal hard drives capacity, which means that this USB hard drives can store up to 8 TB, can be connected by more than 50 computers for sharing and accessing digital data, easy front panel access, hot swap internal drives-no need screwdriver, 4 USB 2.0 ports, 2 Ethernet ports for local network connection, includes 4 energy-efficient, and BlackArmor backup software allows you to backup and restore data easily.

Each evolution in your business can be supported by its flexible capacity which reaches 8 TB, makes you forget not-enough-capacity problem. This USB hard drives is the right choice for capacity problems and sharing data security which supported by password protected web access feature.

Specs

• Capacity : attachable 4 internal drives (max capacity 8 TB)
• Rotation speed : 7200 rpm
• Buffer cache size : 32 MB
• OS requirements : Windows XP and Vista operating systems, Mac OS X 10.4.11 or later.

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By Andreas Lee

usb external hard drive

People in this information era need external media to store their asset. The external media which I’m talking about is USB Drive Hard (USB hard drive). This tool gives large space to store large amount of data and can be easily carried. The size and capacity of USB drive hard have become a requirement for people these days, therefore manufacturer companies compete to create the lightest and smallest USB external hard drive with the biggest capacity.

Besides the capacity and size, some people may not notice even do not understand the performance of USB drive hard. This is another thing which must be considered because the performance can save more time while being used to access or transfer data.

Important Specification of USB Drive Hard

To find a USB external hard drive which has a good performance, there are some specifications that must be observed:

1. Rotational Speed (RPM/rpm)

Rotational speed or RPM (Revolution Per Minute) is rotation speed of disk component on USB drive hard in 1 minute. The faster its RPM, the better data access speed. Rotation speed is available in 4500 rpm, 5400 rpm and 7200 rpm. Choose a USB external hard drive which has the fastest rotation speed, 7200 RPM, because it requires less energy consumption from the computer or laptop.

2. Buffer cache size

Buffer cache is a temporary storage that stores used data. It means that buffer cache gives access speed to used data, so it can help to reduce your waiting time. Buffer cache is available in 8 MB and 16 MB in hard drive market today.

3. Transfer rate

Fast transfer rate does not make you bored while waiting during data back up process. High transfer rate is supported by USB 2.0 interfaced. It is also important for computer users to note because the old version computer / laptop has USB 1.1 port. Most USB drive hard which is sold in the market is currently only compatible with USB 2.0 although some are compatible with both USB 2.0 and USB 1.1.

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