If you're trying to compare equivalent units-of-measure of terabyte (10^12) vs tebibyte (2^40), it's: 28TB (HDD) vs 18TB (LTO-9) ... or ... 25TiB (HDD) v

If you're trying to compare equivalent units-of-measure of terabyte (10^12) vs tebibyte (2^40), it's: 28TB (HDD) vs 18TB (LTO-9) ... or ... 25TiB (HDD) vs 16.37TiB (LTO-9) The 25Tib shouldn't be compared with gp's clarification of 18TB raw uncompressed capacity. https://www.ibm.com/docs/en/ts4500-tape-library?topic=cartridges-capacity-supported-lto-tape https://www.ibm.com/docs/en/ts4500-tape-library?topic=cartri...