All 60 GB SSDs I have found available have a write speed of around 90 MB/s, whilst 120 GB SSDs and higher have upwards of 400 MB/s.
Both have similar read speeds of around 500 MB/s and upwards.
Is there some technological issue that prevents higher write speeds in smaller volume SSDs whilst not affecting read speeds? If so, what is it?
It is suggested below that a RAID 0 configuration could be being employed in the larger drives; this would increase the write speed of the higher end disks while leaving the read speed to be determined by the SATA III connectors. Can anyone cite sources in support of this?
Reading speed/Writing speed Size Sequential Random access 32GB 230MB/s, 40MB/s 90MB/s, 40MB/s 64GB 450MB/s, 80MB/s 170MB/s, 80MB/s 128GB 550MB/s, 170MB/s 270MB/s, 170MB/s 256GB 560MB/s, 320MB/s 300MB/s, 300MB/s 512GB 560MB/s, 460MB/s 300MB/s, 300MB/s 1TB 560MB/s, 460MB/s 300MB/s, 300MB/s
I bought 60 GB, 120 GB and 240 GB drives from the same manufacturer and disassembled them.