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Maxtor D740X data sheet

IBM 60GXP data sheet

Maxtor D740X-6L

The Maxtor D740X-6L comes in 20, 40, 60 and 80GB flavors. The capacity of each disk is 40GB double-sided or 20 MB / side. The 20 GB capacity drive uses a single disk with a single head, 40 GB is realized by moving to a double sided single disk (two heads), at 60 GB we have 2 disks and three heads and the 80 GB top model uses two disks and four heads. Noise reduction is achieved with Maxtor's Fluid Dynamic Bearing that reduces idle noise from 3.0 Bel in the ball bearing (BB) models to 2.7 Bel in the FDB models recognized by the L in the model name. Compared to the IBM drive with its 55 / 400 G shock endurance, the Maxtor D740 series only tolerates 30/300 G over 2 ms, vibration sensitivity is frequency dependent in the range of 0.0004 G2/Hz. Keep in mind that this is an entirely different metric than what IBM is using in their data sheet and the numbers cannot be compared with each other. Nonetheless, these values stress the importance of a vibration-free environment.

Maxtor D740X-6L, 80 GB. The L in the suffix denotes the Fluid Dynamic Bearings as opposed to the -R models assembled in Japan using ball bearings.

The bottom of the drive is shielded and only components that could potentially run hot like the controller chip and the cache are exposed .

The D740X is the first mass produced drive to feature the ATA 133 interface. That means that in burst transfers, 133 MB/sec can be read out of the buffer. The buffer itself is a standard 1Mx 16 SDRAM as those that came on any of the old graphics cards including GeForce 256 (16 bit wide) which matches the width of the IDE interface.

The 1M x 16 SDRAM used as cache are a familiar sight to anone who ever looked at local frame buffers on graphics cards.

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