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IDE Drive Enclosures • How Fast Are Kazans and Firedrives? • Comparing USB 2.0 and USB 1.1

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IDE Drive Enclosures • How Fast Are Kazans and Firedrives? • Comparing USB 2.0 and USB 1.1 January 2002 Vol.4 No.1 Inside this issue: • IDE Drive Enclosures • How fast are Kazans and FireDrives? • Comparing USB 2.0 and USB 1.1 IDE Drive Enclosures What are IDE drive enclosures? Lava’s FireDrive® and Kazan hard drive enclo- sures are the best way to add fast external data storage to a computer system. The enclosures provide users with the benefits of high-speed throughput and the convenience of carry-any- where portability. Designed by Lava, the enclo- sures’ interface boards make any 3½” standard IDE hard disk drives IEEE 1394 and USB 2.0 compatible.The FireDrive® and Kazan come in sturdy cases and ship complete with either IEEE 1394-to-IDE or USB 2.0-to-IDE internal inter- face boards, switching power supplies, and all necessary cables. What makes these enclosures What about Uses and Benefits: so convenient? speed and capacity? • Adding external/portable drive capability for Any standard, inexpensive 3½” IDE hard disk Compared to ZIP™ drives, tape drives, CD-RW MPEGs,AVIs, DTP files drive fits the solid, attractive FireDrive® and drives, and other external drive technologies, • Working directly on the FireDrive® or Kazan cases. FireDrive’s® IEEE 1394 and Kazan’s USB 2.0 Kazan, as if they were internal drives capabilities are far ahead. • Making existing hard drives IEEE 1394 or The Fire Drive’s® IEEE1394 and Kazan’s USB USB 2.0 compatible 2.0 interfaces make data movement a breeze. Device Throughput rate • Backing up data fast Users can work on their MP3, AVI, or graphic Parallel port ZIP drives 800 kbps • Converting smoothly from USB 1.1 to files quickly and efficiently. IDE tape drives 1 Mbps high-speed USB 2.0 USB ZIP drives 1.2 Mbps • Taking advantage of the Kazan’s backward Hot-pluggable and daisy-chainable, the enclo- CD-RW IDE drives 4.8 Mbps compatibility with USB 1.1 sures help users work without any interrup- FireDrive® & Kazan 15 Mbps • Securely storing sensitive materials tions and downtime. • Expanding the drive capacity of notebook The enclosures’ capacity depends on the hard computers The FireDrive® is supported on both PC and disk drive users install: Lava’s drive enclosures • Carrying work between office and home Mac platforms. It provides a simple and trans- hold hard disk drives, which now exceed 80 parent means of moving files between PCs and gigabytes. Macs. Selling tips The Kazan is backwards compatible with USB • An excellent means of adding value to low-margin hard drive sales. 1.1, so current users of USB 1.1 can use a Kazan • A cost-effective way to make drives USB 2.0 and/or IEEE 1394 compatible. right away.To get the full benefit of the Kazan’s • Easier to install than conventional external storage devices. speed, however, a USB 2.0 port is needed. • More convenient to use than conventional external storage devices. • Low cost per megabyte for external storage. • Highest-speed means of external storage. Sequential Read Performance How fast are Kazans transfer demands. Sequential access perform- 35 ance is more important for graphical and video 30 and FireDrives? applications, when file data accesses are relatively few, but files can be large. 25 Two things matter when talking about hard 20 drives: capacity and speed. When looking at Lava tested each drive with various sizes of data drive enclosures,assessing capacity is simple:the transfer (block sizes) to gain the fullest possible 15 capacity of a hard drive does not change when picture of the performance of its drive enclo- 10 you put it into the Lava enclosure. Using a 60 sures. 5 gigabyte hard drive will give you a 60 gigabyte external drive enclosure. The basic conclusions from testing these 0 1k 2k 4k 8k drives are: 16k 32k 64k 128k 256k 512k Assessing speed is more complicated. To start Block Size 1024k 2048k with, the faster the drive you put into the enclo- 1) the FireDrive® IEEE 1394 and the Kazan Random Read Performance sure, the faster the overall result. At the same USB 2.0 are similar in performance 25 time, because external drives must communi- cate with the system across a bridging hardware 2) both the FireDrive® and the Kazan move 20 interface, some overhead is introduced. In no data at between 50% and 75% of the speed case will any external drive —Lava’s or any of a direct motherboard connection 15 other type —be as fast as the same hard drive 10 with a direct motherboard IDE connection. 3) with the FireDrive® and Kazan IDE drive Mbytes/sec Mbytes/sec That said, in most cases a user will see no dif- enclosures, you can have the best of both ference between a hard disk directly connected, speed and capacity 5 and a hard disk in a FireDrive® or Kazan drive enclosure. Legend Internal Connection 0 x Kazan 1k 2k 4k 8k 16k 32k 64k Fire Drive 128k 256k 512k Block Size 1024k 2048k These graphs show the performance of a typical 7200 rpm, 20 gigabyte hard drive in three Sequential Write Performance Sequential Write Performance scenarios: directly attached to the computer’s 25 25 motherboard, installed in a Kazan USB 2.0 IDE drive enclosure, and installed in a FireDrive® 20 20 IEEE 1394 drive enclosure. In each case, the 15 15 drive’s read and write speeds were tested. Random access testing evaluates how well a Mbytes/sec 10 10 drive writes or retrieves data randomly located Mbytes/sec on a drive. Random access speed is important 5 5 for applications such as databases where the drive needs to process a large number of small 0 0 1k 2k 4k 8k 1k 2k 4k 8k 16k 32k 64k 16k 32k 64k 128k 256k 512k 128k 256k 512k 1024k 2048k Block Size 1024k 2048k Block Size Kazan’s Speed: Comparing USB 2.0 and USB 1.1 Sequential Write Performance 12 Our customers say that one of the reasons they The chart on the right compares the Kazan’s like the Kazan is because it is both USB 2.0 and performance with USB 2.0 and USB 1.1 hosts. 10 USB 1.1 compatible. With a Kazan, users can With USB 2.0, the improvement is extremely continue working with USB 1.1 and upgrade to impressive. Of course, as USB 2.0 is still new, 8 USB 2.0 whenever they see it fit.There is, how- most users will need to add USB 2.0 capability 6 ever, one very clear benefit to start using the to their systems with a USB 2.0 host adapter, Mbytes/sec USB 2.0 interface as soon as possible: Kazan’s such as Lava’s two-port USB 2.0 Host Adapter. 4 blazing USB 2.0 speed. It makes a great companion sale to a Kazan. 2 Legend Sequential Read Sequential Write 0 USB 1.1 USB 2.0 Random Seek & RW USB Version 2 Understanding Throughput Numbers Profile File When describing data throughput rates to hard drives or across I/O interfaces, the terminology and Located on the east coast, Atlantic Cable is abbreviations can be confusing. Here’s what it all means. a leading service-oriented, wholesale distrib- utor/manufacturer of computer cables, net- To start, quantities of data are measured in “bits” or “bytes.” A byte is simply eight bits. When describ- working products, and accessories. With ing data storage capacity, the industry typically speaks of bytes of data: a floppy disk has 1440 kilobytes locations in Southern NH and Metro of storage capacity, a hard disk has 20 gigabytes of storage capacity, and so on. When it comes to Atlanta,they offer next day delivery on thou- data flows, however, we tend to speak of bits of data: a hard disk has a throughput of 25 megabits per sands of products at low shipping rates.They second, a 16550 UART serial port has a speed of 115.2 kilobits per second, a Fast Ethernet connec- have a “No Order Too Small” policy, stock tion is a 100 megabit per second connection, etc. only quality products —including Lava cards —and deliver them for a reasonable value. Throughput measurements specify a given quantity of data transferred in a given length of time, usually a minute or a second. When comparing products’ relative speeds, it is important to be aware Atlantic Cable has a fully-staffed production of inconsistent and overlapping abbreviations for “megabits per second” and “megabytes per second” area making small quantities of specialized to avoid misconceptions.The table below lists some of the standard throughput measures and their cables, and a main factory in China produc- abbreviations, and points out a possible area of confusion. ing their stock line of molded cable assem- blies as well as custom configurations in as Full Term Correct Abbreviation Other Abbreviations Used low as 100 piece quantities. They stock a kilobits per second kbps Kbps complete assortment of products that sup- megabits per second Mbps mbps; Mb/s; MBps, MB/s port LAN/WAN requirements and distrib- megabytes per second MB/s Mb/s; MBps ute products from Lava, KTI Networks, Middle Atlantic Datatel, Raritan Computer, For example, Lava’s FireDrive® has a maximum sustained throughput of about 15 Mbps.A compet- ICC, and many others. ing product might claim a maximum sustained throughput of 15 MB/s. Do not be misled; the two drives transfer data at the same speed. Atlantic Cable’s knowledgeable, helpful sales consultants, reliable in-stock products, and unsurpassed technical support show they are eager to earn the business of their cus- How do I hook up a tomers.
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