ɪspˈɛʃəli fɔːɹ ˈoʊldɚ "blˈuː ɹˈɪŋz" mˈɑːdəlz tˈuːhˈʌndɹɪd mˈɛɡəhˌɜːts ˈɑːɹm sˌiːpˌiːjˈuː ænd θˈɜːɾi tˈuː mˈaɪ bˈiː ɹˈæm, wˌɛɹ ɪt vˈɛɹiz bᵻtwˌiːn θɹˈiː sˈɪks ˌɛmbˈiː slˈæʃ ˈɛs, wɪð ɐn ˈævɹɪdʒ ʌv fˈoːɹ.fˈaɪv ˌɛmbˈiː slˈæʃ ˈɛs. ðə nˈuːɚ "wˈaɪt lˈaɪts" maɪ bˈʊk wˈɜːld ᵻdˈɪʃən wˈʌn tˌiːbˈiː ænd tˈuː tˌiːbˈiː stˈoːɹɪdʒ kəpˈæsᵻɾi mˈɑːdəlz, dˌʌbəljˌuːdˌiːˈeɪtʃ wˈʌn ˌɛnsˈiː ænd dˌʌbəljˌuːdˌiːˈeɪtʃ tˈuː ˌɛnsˈiː ˈɑːksnəz ˈeɪthˈʌndɹɪd tˈɛn, θɹˈiːhˈʌndɹɪd ˈeɪɾi mˈɛɡəhˌɜːts ˈɑːɹm sˌiːpˌiːjˈuː ænd wˈʌnhˈʌndɹɪd twˈɛnti ˈeɪt mˈaɪ bˈiː ɹˈæm, hæv dɹˈaɪv spˈiːdz kˈɑːmpɚɹəbəl tə jˌuːˌɛsbˈiː, æɾ ɐbˌaʊt tˈɛn ˌɛmbˈiː slˈæʃ ˈɛs ɹˈaɪt ænd twˈɛnti fˈaɪv ˌɛmbˈiː slˈæʃ ˈɛs ɹˈiːd.
Especially for older "blue rings" models (200 MHz ARM CPU and 32 MiB RAM), where it varies between 3–6 MB/s, with an average of 4.5 MB/s. The newer "white lights" My Book World Edition 1 TB and 2 TB storage capacity models, WDH1NC and WDH2NC (oxnas810, 380 MHz ARM CPU and 128 MiB RAM), have drive speeds comparable to USB, at about 10 MB/s write and 25 MB/s read.