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Seagate introduced the ST-506, the first 5.25-inch HDD, with a capacity of 5 megabytes in 1980 for the personal computer.The first IBM XT computers used MFM hard drives. MFM allows a transfer rate up to 5MB/s and were only available in sizes from 5MB to 100MB. The data cable was 20 pin and another 34 pin cable. These drives fit into a 5.25” bay. It was not uncommon to have as many as 10 or more bad sectors with the drive still fully functional despite the areas that were marked. The drives had to be parked before the PC was transported to prevent damage from the drive heads impacting the disks.The first IBM XT computers used MFM hard drives. MFM allows a transfer rate up to 5MB/s and were only available in sizes from 5MB to 110MB. The data cable was 20 pin and another 34 pin cable. These drives fit into a 5.25” bay. It was not uncommon to have as many as 10 or more bad sectors with the drive still fully functional despite the areas that were marked. The drives had to be parked before the PC was transported to prevent damage from the drive heads impacting the disks.== SATA ==* == SATA 2 ==*